Strike-Legal (V7)
From AmtWiki
From the 7.2 Rulebook
This refers to a portion of a weapon that is at least 2.5 inches in diameter (flat blades require 1.5 inches of foam on a striking surface and may not pass their tip through a 2.25 inch ring) and will not leave marks, bruises, or broken bones when used to hit your opponent. This is the only area of a weapon that counts as a legal blow. Stab-only weapons are still required to have six inches of strike-legal surface on any stabbing end for safety. This must be covered in a durable, opaque cloth.