Made from environmental-friendly material, odor-free and harmless 3 star table tennis balls, 40mm in diameter, single ball weights around 3g. Affordable yet durable,even and smooth seem ensures excellent spin and bounce. These table tennis balls are built to last so you can keep the game going without worrying about cracks or dents. Perfect for Ping Pong competition, training, entertainment, beer pong, party decoration, pet toys, etc.