Support weapons include a variety of grenades and enemy detectors. For grenades and mines, the "amount" is like ammo, it is just how many you get.
 M67 Frag Grenade
A throwing grenade that everybody gets as the default support weapon. Unlike the other default items, this one is actually pretty useful. You pull out the pin by clicking down on the mouse button and throw it by letting go of the mouse button. After throwing, The grenade takes exactly five seconds to explode dealing variable damage depending on how close the enemy was to it. If the grenade lands and explodes very close, it deals an instant kill.
After the grenade lands on the ground, it still takes a few seconds to detonate, so if you hear a tingling sound on the ground, you better run, or else you'll be blown up. The M67 Frag Grenade is also the most portable free item, so it is useful for running flags in Capture the Flag.
If you pull the pin, but are killed before you throw it, the grenade lands on the ground. You can use this to your advantage with a method called "suicide bombing". To suicide bomb, you pull the pin out of a grenade right before you die, so that the person who killed you may get blown up. The grenade does not drop if you were sprinting when you died.
 M69HE Frag Grenade
This handy high-powered frag grenade is better than the regular M67 Frag in several ways. It has a larger range of impact and deals more damage relative to range. It also explodes quicker, with less delay time. The M69HE Frag doesn't make a sound when it hits the floor around you, so you probably won't know to run away from it.
The M69HE Frag is the most portable item available, on par with the Heartbeat Detector.
 M18 Smoke Grenade
This smoke grenade does no damage, but instead blankets the immediate area with a thick cloud of grey-colored smoke that is impossible to see through. It is useful for cover and stealth in Capture the Flag, but players rarely find it useful in other situations. Therefore, it doesn't cost a lot.
The cloud of smoke dissipates in 15 to 20 seconds.
 XM84 Flash Grenade
The flash grenade is good to use in a variety of situations. Although it does no damage, it will blind an enemy for a full 20 seconds if it lands at their feet. The duration and effect will go down dramatically the further away from the person the flash grenade detonated.
During the period that your enemies are blinded, they will only see pure white on their screen. Then, their view begins to come back, but they will be disoriented with confusing images that combine where you are and where you were before, making it impossible to aim.
 M24F Incendiary Grenade
Upon detonation, this incendiary grenade produces a cloud of orange chemicals in the vicinity of the blast. Any enemy who steps into the fire suffers periodic HP damage. After the person exits the cloud, he or she will continue to be on fire and take damage for several seconds. During that time, they will be easy to notice because they will be in bright orange flames.
When a person steps in fire, the screen will flash orange until the effect wears off. Fire damage can be reduced by wearing a fire mask, and the fire cloud dissipates in 15 to 20 seconds.
Not many people get kills from this item, instead, they use it as a "softener" to lower the enemy's HP to make them easier kills.
Starting with 100 HP and no fire protection, up to 50 health can be lost if you get out of the fire cloud almost immediately after starting to burn.
 G7A Gas Grenade
The gas grenade releases a cloud of purple chemicals that damages HP more quickly than does the fire cloud. The main difference is that when someone steps out of the gas cloud, the effect ceases almost immediately. People in gas can be identified easily because they appear to be convulsing. Also, gas ignores AP, so full HP damage will be taken.
The gas cloud takes longer to dissipate, around 20 to 30 seconds. Gas damage can be reduced by wearing a gas mask.
 M16A1 AP Mine
The mine can be key to victory in games, but only if placed strategically in proper areas. Planted mines can be seen very easily above ground, and there isn't any use putting one out in the open where anybody can see it. A few examples of strategic mine placements are:
- On a flag in Capture the Flag
- In narrow areas and doorways
- On ladders
- In dark areas where it might not be seen
- Corners where your enemies normally camp
Basically, the person with mines (you get 3), can plant the mine anywhere, and someone who steps on it will suffer exactly 80 damage to HP. A mine explosion will trigger other mines within the blast radius. Therefore, if there are just two or more mines planted in a cluster, stepping on either one will cause an instant kill.
If you see a mine in your way, you can jump over it, or shoot the rod of the mine from a distance.
Good areas for mine placement in each map are detailed in the guide page for that map.
 Heartbeat Sensor
This very portable little device can detect enemies, but only at a short range. When you hold the mouse button, detected enemies will appear as orange dots on the minimap. The use is limited by a battery life, shown around the minimap. The battery recharges when the device is not in use.
Due to its ridiculously small range, the Heartbeat Sensor is used by very few players and is deemed the most useless item. An enemy who is so close that you can detect them with this item has probably already seen you.
Although, this can be an extremely useful item in small battles in small maps. (4 or less players, Cold seed size and smaller)
 Heartbeat Detector
This "upgraded version" of the Heartbeat Sensor is about ten times better than the Heartbeat Sensor, with the ability to send the orange dots to your teammates minimaps as well. Since the usefulness of the Heartbeat Sensor was just about zero anyways, most players deem this just as useless. And zero times ten is zero. The range isn't even any better.
The Heartbeat Detector is one of the two items tied for highest portability - the other being the M69HE Frag.