Measuring 5.90 x 1.18 inches, this double sided reflective keychain is compact and easy to carry. It fits road bike saddles, mountain bike parts, school bags and daily backpacks for hanging use. Designed with high brightness double sided reflection, it delivers clear warning effect during night riding and walking trips. Made in soft long ribbon shape, it fits well with daily use, stays firmly attached and hard to fall off. It lights up brightly with faint night light, greatly securing after dark travel for students and bike lovers. Feel free to send us inquiry anytime.