The Vulcan 5.75 Square Court Markers are designed and developed specifically for the system and are featured in many of the game development systems instructional drills. Unlike traditional court court-markers where players are coached to hit towards a specific target, the 5.75 square markers are designed to be used together to create specific sections on the court where players should try to hit.Each 12-pack also includes a booklet of instructional drills for use.