Main Color: Silver Tone, White; Package Content: 40pcs x Curtain Track RollerProduct Name: Curtain Track Roller; Material: Plastic, MetalWeight: 377g; Wheel Dia: 13.5mm/0.55"Ring Inner Size: 13mm/0.5"(D)Overall Size(Not Include Ring): 28 x 18 x 17mm/1.1" x 0.7"x 0.67"(L*W*H)13.5mm dia wheel curtain track roller,easy installation.These rollers are made of plastic and metal material, you will not worry about blemishing your beautiful curtain. and widely used in home, office, restaurant, hotel, etc.