Deluxe Martial Arts, Taekwondo, Karate Rebreakable Board Set of 4 - All Levels 4 Deluxe Re-breakable Breaking Boards use over & over again. Yellow (Easy for Kids)- size 9"x12"x3/8" Blue (Easy for Teens)- size 9"x12"x3/8" Red (Medium Strong)- size 9"x12"x.5" Black (Hard for Advanced)- size 10"x13.5"x.5"