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 : 9mm/ 0.35";Hole Inner Diameter : 7mm/ 0.28"Weight : 16gPackage Content : 20 x Curtain Track Rollers 9mm 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.