Features: White Nylon PP materials Wheel Tyre Double ball bearing swivel head Universal casters Quiet, Wear-resisting Handiness, Shock absorption Would no longer scratch the floor Ideal for various uses and position Specifications: Material: Nylon PP Material And Steel Load bearing: 10kg (each) Size: display as photos Finishing : Black Screw Size : M8 x 13mm, 40mm Package included: 1/4/8/10pcs x Casters with brake