Color: White; Total Size: 15 x 15mm/0.59" x 0.59"(L*D)Material: Plastic; Net Weight: 7gPackage Content: 10 x Curtain Track Rollers; Product Name: Curtain Track RollersBolt Size: 7.5 x 3mm/0.3" x 0.12"(D*L)Hole Diameter: 4.5mm/0.18"These rollers are made of plastic material, you will never worry about blemishing your beautiful curtain.