It will be boosted before shipping. 37-38 for backhand, 39-41 for forehand.The PINGPANGWANG Super Alpha Boosted is a high-performance offensive rubber engineered for players who demand peak velocity and a professional “tuned” feel. This specialized version of the Super Alpha series comes factory-boosted to maximize sponge elasticity, providing a significant increase in the catapult effect. It is the premier choice for offensive players seeking a rubber that combines deep ball immersion with an explosive, high-energy release.