Size detail: inner diameter is approx. 28.6 mm while the external is 34.9 mm, total weight is about 45 g. Feature of carbon fiber bicycle headset spacer: more resistant to corrosion, harder than aluminum alloy headset spacer, and lighter than aluminum alloy made one. Material of bike handlebar spacer: woven carbon, nice look and good quality, light weight, good strength and well temperature resistance, good impact resistance. Appearance and performance: automatic cutting, smooth edge, fit most of the road bicycles, delicate texture and durable to use. Multi-size package: this package contains 7 different sizes, 1 mm, 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, small size of spacer headset let you have a more precise height adjustment.

Date First Available: October 22, 2017. Best Sellers Rank: #4,719 in Sports & Outdoors. Customer Reviews: 4.7 out of 5 stars 3,523 ratings 4.7 out of 5 stars. : B076QBGXPF. Part Number: ?Sumind-Headset Spacer-01. Manufacturer: ?Sumind. Material: ?Aluminum_alloy, Carbon, Carbon_fiber. Color: ?Black. Brand Name: ?Sumind. Package Weight: ?0.04 Kilograms. Item Package Dimensions L x W x H: ?4.92 x 2.48 x 1.61 inches.