"Sturdy MaterialMade of 100% high-quality steel + ABS plastic, the shuffleboard rollers are durable, rust-proof and damage-resistant, bringing you a lot of fun.Size DetailsThese mini shuffleboard sets are 23x23x7mm (0.9x0.9x0.3 inches) --- Weight -13g/piece, perfect for all desktop shuffleboard and bowling curling tables.Package Included8 red shuffleboard rollers and 8 blue shuffleboard rollers, enough quantity to meet your different needs.Steel Ball BearingsThe shuffleboard glides smoothly on the playing surface, simulating real curling and shuffleboard, bringing the most fun.Fun Indoor LeisureThese shuffleboard curling wheels will provide you and your family with many unexpected happy hours, helping you control your strength, improve your eye-hand coordination, and make it more exciting and fun."