The perks in Call of Duty: Black Ops multiplayer provide you with numerous abilities and enhancements to customize your classes. The Perks are divided into 3 slots allowing you to have three Perks enabled at a time. The Perk you choose in slot 1 will also determine the look of your multiplayer character. For example, if you choose the Ghost Perk you will be equipped with a ghillie suit.

Each of the 15 perks also have corresponding Pro versions of each perk that will give you further abilities. You can unlock these Pro abilities by completing challenges in the multiplayer games. Listed below are the standard abilities that each perk provides along with the added abilities once you unlock the Pro version.

Slot 1 Perks
Lightweight | Lightweight Pro

  • Standard Ability: Allows you to run and move faster. How fast you run also depends on the primary weapon you have equipped.
  • Pro Ability: No falling damage.

Scavenger | Scavenger Pro

  • Standard Ability: Replenishes your ammunition and lethal grenades when you walk over scavenger bags that are dropped by dead players. This does not resupply launchers or equipment.
  • Pro Ability: Doubles your starting ammo with extra magazines. This replenishes your tactical grenades as well.

Ghost | Ghost Pro

  • Standard Ability: You're undetectable by the Spy Plane or Blackbird killstreak.
  • Pro Ability: Undetectable by aircraft, infrared and sentries. Enemies won't see your name or a red crosshair when targeting you.

Flak Jacket | Flak Jacket Pro

  • Standard Ability: Flak Jacket reduces explosive damage and allows you to survive any indirect explosive attacks.
  • Pro Ability: Provides extra fire resistance and allows you to reset the fuse of a thrown grenade when you pick it up.

Hardline | Hardline Pro

  • Standard Ability: Reduces the amount of kills required for any killstreak by one.
  • Pro Ability: Allows you to randomly choose another Care Package reward. When you open a Care Package, you can either take the reward or try again.

Slot 2 Perks
Hardened | Hardened Pro

  • Standard Ability: Increases your weapons bullet penetration (but not bullet damage).
  • Pro Ability: Your weapons do extra damage to aircraft and turrets. This also reduces flinch when you are shot.

Scout | Scout Pro

  • Standard Ability: You are able to hold your breath longer when steadying a weapons scope.
  • Pro Ability: Allows you to switch between your weapons faster.

Steady Aim | Steady Aim Pro

  • Standard Ability: Steady Aim increases a weapons hip fire accuracy.
  • Pro Ability: This enables you to aim quicker after sprinting and recover faster from a knife lunge.

Sleight of Hand | Sleight of Hand Pro

  • Standard Ability: Gives a faster reload time.
  • Pro Ability: Allows you to aim down the sight faster than normal. This does not work with weapons that have scopes.

Warlord | Warlord Pro

  • Standard Ability: Allows you to put 2 attachments to your primary weapon.
  • Pro Ability: You start with one extra lethal and tactical grenade (except smoke).

Slot 3 Perks

Tactical Mask | Tactical Mask Pro

  • Standard Ability: Protects you against NOVA GAS.
  • Pro Ability: Tactical Mask Pro reduces the effects of flashbangs and concussion grenades. It also reveals the position of a flashed or stunned enemy on your mini map.

Marathon | Marathon Pro

  • Standard Ability: This gives you a longer sprint.
  • Pro Ability: Gives you unlimited sprint.

Ninja | Ninja Pro

  • Standard Ability: Ninja allows you to move silently.
  • Pro Ability: When you have this equipped, enemies will be louder while you will be completely silent.

Second Chance | Second Chance Pro

  • Standard Ability: Allows you to pull out your pistol before dying.
  • Pro Ability: If you have Second Chance Pro equipped you can survive longer and gives your teammates the ability to revive you.

Hacker | Hacker Pro

  • Standard Ability: Allows you to see enemy explosives, equipment, and Tactical Insertions.
  • Pro Ability: Hacker Pro allows you to booby trap enemy Care Packages and turn enemy killstreaks and equipment friendly.