Specification: Material: carbon fiber material Color: Black The inner diameter of the spacer is 28.8 mm the outer diameter is 34.9 mm Suitable for 1 1/8"(28.6mm) fork steerer tube of most mountain bike Bicycle spacers with smooth surface and exquisite workmanship Package included: 2 x 1mm Carbon Fiber Bike Fork Washer 2 x 2mm Carbon Fiber Bike Fork Washer 2 x 3mm Carbon Fiber Bike Fork Washer 2 x 5mm Carbon Fiber Bike Fork Washer 1 x 10mm Carbon Fiber Bike Fork Washer 1 x 15mm Carbon Fiber Bike Fork Washer 1 x 20mm Carbon Fiber Bike Fork Washer