Main Color: Silver Tone, White; Package Content: 50(+/-2%)pcs x Curtain Track RollerProduct Name: Curtain Track Roller; Material: Plastic,MetalWeight: 289g; Wheel Dia: 10mm/0.4"Ring Inner Size: 8 x 7mm/0.3" x 0.28"(L*W)Overall Size(Not Include Ring): 25 x 15 x 14mm/1" x 0.6" x 0.55"(L*W*H)10mm dia wheel curtain track roller,easy installation.These rollers are made of plastic material, you will not worry about blemishing your beautiful curtain. and widely used in home , office, restaurant, hotel, etc.