Arm

An R6 arm on Roblox is a brick that is part of a humanoid that goes on the left and right of your Torso. An arm is precisely 1 stud wide, 1 stud long, and 2 studs tall.
A package or bundle comes with a left arm and a right arm.
Since the release of R15, Arms were split in three: Right/Left: UpperArm, LowerArm and Hand.
== Trivia ==
* Robloxians carry tools and weapons with their right hand. Removing the right hand will make a user unable to use a Tool.Tools without Handles, however, do not need an right arm to do something.
* The arms can go through a brick that has the CanCollide function enabled, since arms have this value off.