[Bicycle reflector set]: the kit contains: 2 x red reflectors (mounted behind the bicycle seat post), 2 x white (mounted on the handlebar) [Safety guarantee for night riding]: The front and rear bicycle reflectors can reflect strong light in low light conditions, improve your visibility when driving and let others see you in the dark and in poor visibility to ensure your safety Easy to install: this cat's eye reflector is very easy to install, you just need to tighten the notches on the spokes, align the hole of the reflector with the plug and press the plug inwards until it is in place, then tighten with a screwdriver. [Wide Application]: Suitable for most bicycles, motorcycles and mountain bikes, children's or adult bikes etc. Please measure the size of the bike before purchase