Perks are special abilities you can select for each of your create-a-class classes. There are three "tiers" of perks, and you can have only one active perk for each tier.

Perks are unlocked by advancing your rank.

Each perk also has a pro version. The pro perk grants additional abilities whenever you use that perk. To unlock a pro perk, simply use the standard version of the perk. After you use it enough you will unlock the pro version (see the "pro unlock" entry below for the exact requirement).

Perk		Ability	Unlock	Price	Pro Ability	Pro Unlock
Tier One Perks
	Lightweight	Move Faster	Level 4	2000	No Falling Damage	[Unlock] Escape Death: Escape death 5 times after being shot. Melee Kills: Get 15 melee kills. Offense Medal: Get 10 offense medals by killing enemies near their objectives.
	Scavenger	Resupply from dead bodies. Does not resupply launchers or equipment	Level 4	2000	Doubles your starting ammo with extra magazines, replenishes tactical grenades	[Unlock] Resupplies — Resupply 150 times while using Scavenger. Grenade Kills — Get 5 Lethal Grenade kills with a resupplied grenade. Kill Count — Get 5 kills without dying 5 times.
	Ghost	Undetectable by Spy Plane and Blackbird	Level 4	2000	Undetectable by aircraft, Dogs, Infra-Red and Sentries. The enemy won’t see your name or a red crosshair when targeting you	[Unlock] Concealed Kills – Kill 20 enemies while they have a Spy Plane or Blackbird active. Destroy Aircraft – Destroy 30 aircraft with any non-Killstreak launcher. Destroy Sentry Gun – Destroy 1 Sentry Gun.
	Hardline	Killstreaks 1 kill early	Level 4	2000	Get a second chance on the result of care packages	[Unlock] Share 10 Care Packages with your Allies Earn 7 killstreaks in one match using Hardline Get 7 kills without dying in one match
	Flak Jacket	Extra explosives resistance	Level 4	2000	Extra fire resistance and reset fuse when you toss back	[Unlock] Survive 10 explosions with Flak Jacket perk. Throw back 5 enemy grenades. (No Kill's Required) Plant or disarm 10 bombs in Demolition, Search and Destroy, or Sabotage.
Tier Two Perks
	Hardened	Extra bullet penetration	Level 4	2000	Bullets do extra damage to Aircraft and Turrets. Reduced flinch when shot at	[Unlock] increases bullet damage to killstreaks and causes the player's aim to recoil less when taking damage.
	Scout	Hold breath longer	Level 4	2000	Switch between weapons faster	[Unlock] increases the amount of time that a player can hold their breath when steadying a scope.
	Steady Aim	Extra accuracy when shooting from the hip	Level 4	2000	Quicker aiming after sprinting and quicker recovery from knife lunge	[Unlock] Melee two enemies consecutively in 5 seconds. Kill 100 enemies after sprinting. Kill 150 enemies while hip firing.
	Slight of Hand	Faster reload	Level 4	2000	Faster aiming down sights with non-scoped weapons	[Unlock] Aiming Kills: Get 150 Kills when aiming down sights. Reload Kills: Kill an enemy within 5 seconds of reloading 30 times. Fast Hand Kills: Reload and finish off the enemy you wounded 10 times
	Warlord	2 attachments on primary weapon	Level 4	2000	Start with one extra lethal and tactical grenade (except smoke)	[Unlock] Warlord is Black Ops equivalent of Bling, allowing you to have 2 attachemnts on your weapon at a time. Its pro effect allows the user to have one extra lethal and tactical grenade.
Tier Three Perks
	Marathon	Longer sprint	Level 4	2000	Unlimited sprint	[Unlock] 26 Miles: Sprint 26 Miles using Marathon. First Blood: Get the First Blood Medal 10 times. Captures: In Capture the Flag, get the Flag Capture medal 15 times while using Marathon
	Ninja	Move silently	Level 4	2000	Louder enemy footsteps, makes you completely silent	[Unlock] Getting 150 suppressed weapons kills Earning 5 Backstabber Medals Planting the bomb 10 times in Search and Destroy, Demolition, or Sabotage.
	Second Chance	Pull out pistol before dying	Level 4	2000	Survive longer and any team mate can revive you	[Unlock] Kills — Get 10 kills while in Second Chance. Revenge — While in Second Chance, kill the enemy who downed you 5 times. Headshot — Get 1 headshot kill while in Second chance.
	Hacker	Detect enemy equipment and explosives	Level 4	2000	Booby trap enemy Care Packages and turn enemy killstreaks and equipment friendly	[Unlock] Pro effect allows the user to booby trap enemy Care Packages, turn enemy killstreaks and equipment friendly, and remain undetected by enemy Motion Sensors.
	Tactical Mask	Reduce the effect of Flash and Concussion grenades	Level 4	2000	Reduces the effects of Gas and Concussion grenades. Reveals the location of a flashed or stunned enemy	[Unlock] Flash Kills — Kill 20 enemies that are blinded by your Flashbang. Concussion Kills — Kill 20 enemies that are stunned by your Concussion Grenade. Nova Gas Kills — Kill 20 enemies poisoned by your Nova Gas.