Product Name: Office Chair Caster Wheels

GUARANTEED NOT TO DAMAGE FLOORS - Encased with soft, smooth polyurethane, our casters are safe to use on hardwood, carpet, tile, and more without leaving any scratches or marks. No desk chair mat necessary

Product name: Chair caster

Material: PU

Product Dimensions:6 x 3 x 4.5 inches

Color: Black, white, red, orange etc

Stem size:7/16" diameter 7/8" length

http://fr.zinhardware.com/