Aluminum alloy bicycle seat collar weighs 40 g, offering lightweight strength with durable, corrosion resistant performance and no fading. Hollow design is partially hollow to keep weight down while maintaining strength, giving a sleek look and a touch of color to your bike. Easy to adjust without tools, this seat post collar lets you change saddle height quickly and smoothly. Compatible with a wide range of bike styles. Wide range of uses with an ergonomically designed fast flow clamp that remains effective and comfortable for many applications, including road bikes, mountain bikes, folding bikes and more. Use scenarios Road bike commuting: quickly and tool adjust seat height for comfort and riding position during daily rides. Mountain bike trail riding: adjust saddle height on varying terrain to maintain control and efficiency. Folding bike travel or urban cruising: benefit from lighter weight and stylish color accent while preserving clamp performance and compatibility.