Different sizes and enough quantity: Bring convenience to customer, you just need to choose 1 item then you can get a variety of combinations. In consideration of the use situation, the combination has 2 pack often use size and 1 piece less use size. Comes with 7 different sizes, 11 pieces in total. Size of 1 mm, 15 mm, 20 mm each has 1 piece, size of 2 mm, 3 mm, 5 mm, 10 mm each has 2 pack. You are also able to mix and match the different size of bicycle handlebar spacers to get the fit you wanted. Feature: These bike spacers are made of carbon fiber that is lighter, harder and more resistant to corrosion than alloy. With good strength, automatic cutting of thin and flat incision, do not peel, match each other and install easily. Can goes with your bike really well, fit on firmly and they line up well to each other. These headset spacers are solid. Specification: Color: black Material: carbon fiber Weight: 45 g Internal diameter: 28.6 mm External diameter: 34.9 mm Package: 1 x 1 mm Headset spacer 2 x 2 mm Headset spacer 2 x 3 mm Headset spacer 2 x 5 mm Headset spacer 2 x 10 mm Headset spacer 1 x 15 mm Headset spacer 1 x 20 mm Headset spacer