Product Name : Curtain Track Rollers;Material : Plastic, MetalColor : White;Overall Size : 28 x 13x 12mm/ 1.1" x 0.5" x 0.5" (L*W*T)Roller Diameter : 8.5mm/ 0.33";Hole Inner Diameter : 7mm/ 0.28"Weight : 6gPackage Content : 8 x Curtain Track Rollers8.5mm dia roller, 7mm hole curtain track rollers. These rollers are made of plastic material in white, you will never worry about blemishing your beautiful curtain.