Feature: *A set is composed of two pieces; *The middle diameter of the handlebar is generally only 25.4mm and 31.8mm. *After installing this reducing sleeve: *A handlebar with a diameter of 25.4 becomes 31.8. Specification : Product name: variable diameter tube Material: aluminum alloy Weight: about 10g (piece) Size: about 41mm long, about 31mm wide Thicknes: about 3.2mm Purpose: The installation diameter in the middle of the handlebar is 25.4MM, and after installing the reducing sleeve, it becomes 31.8MM Package Included: A pair of variable diameter tube Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Compatibility - 2x Bike Handlebar Shims Bicycle Handlebar Stem Shims Handle Bar Adapter Reducer Good Performance Materials - These bike accessories are made of premium material, ensuring their durability and long-lasting performance. Optimal Performance - These accessories offer versatility and adaptability to different cycling needs and provide optimal performance and reliable functionality enhance the riding experience and ensure safety. Easy Installation - These accessories can be easily installed on your bike to get your bike running again. After-sale Serive - We provide high quality products, if there is any problem with our product, please contact us.