Is ping pong ball rubber

Answer 1

The rubber coating may be of pimpled rubber, with the pimples outward, or it may be a rubber that is composed of two materials, a sponge layer, covered by a pimpled rubber, with the pimples pointed inwards or outwards. * Inverted (non-Chinese): This is the most widely used rubber type. * Inverted (Chinese): Chinese rubbers typically have stickier (or "tackier") topsheets. * Short pimples (or "pips"): Short pimples-out rubbers are usually used by close-to-the-table hitters. * Long pimples (or "pips"): Long pimples-out rubbers carry relatively long and soft pips. * Anti-spin: Anti-spin rubbers may look similar to the inverted ones, but their surfaces are very slick and frictionless. * reference: http://www.ittf.com