Speed : 7 Back Spin : 12 Control : 9 Long pimples Sponge : 0.5mm Sponge color : red Total thickness for rubber 1.8+/-0.03mm Suit for defense Made in China and original packing 1615 Monster Rubber is one of the series of 1615 long pimpe rubbers, and feature cunning long pimples. The rubber is thin but well-proporioned. The thin and flexible pimples will reshape irregularly when hitting, which can create counterforce to make the ball to move swiftly and uncertainly, also the unique pattern on top of the pimples can increase the friction and back spin force.