U.S. Art Supply 9" X 12" White/Blue Professional Self Healing 5-6 Layer Double S
Durable 6-Layer Self Healing Construction. Size: 9" x 12" 12" x 18" 18" x 24" 24" x 36" 36" x 48" 40" x 60". Special Feature Reversible, Non Slip. The green/black mats are reversible with grid markings on each side.