Silicone carbide material and strong synthetic fibers that provide excellent durability and performance while the uniform, open-screen construction helps reduce loading. DiamondBack Wood Gymnasium Floor Screens stay sharp until the mineral is completely utilized. The mineral is graded closely and bonded on both sides of the mesh to ensure consistencyh. No clogged screen holes. DiamondBack Screens can be used wet or dry from 178-330 RPM.