Features: Make of ABS tube and reflectives coating film which durability and not easily to fade. During terrible weather, it will reflect under light irradiation to improve cyclings safety and reduce the risk of accidents.(It could not bright itself, need external light!) Waterproofs and light weights, allow it to used in humid weather and will not increase the burden on the bikes. Suitable for most kind of bicycles, such as Mountain Bikes/Foldings Bikes/Kids Bikes/Road Bikes. Easily installation: Just push the spoke reflectors on the spoke and gradually pressings it down. Specifications: Materials: ABS pipe and reflectives film Color: Silver/Gray/Redness/Yellow/Oranges/Blue color/Green Length: about 75mm/2.95inch Inner Diameter: about 1.9-2.4mm/0.07-0.09inch Outer Diameter: about 5mm/0.20inch Package Includes: 12pcs/Set Cyclings Reflectors note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.