Fangrui Product Details 1. Concealed Aluminum Alloy Bell For Bicycles Mountain Bike Bell 2. Lightweight And Compact, Taking Up Little Space 3. Composed Of Various Materials, It Can Reach A Sound Level Of 90db, With A Clear Ringtone. High Elasticity Spring For Stable Sound Output, Alloy Material Speaker, Clear And Loud Ringtone, Round And Smooth Trigger For The Pluck, Effortless To Strike 4. Resistant To Water And Rust, Stainless Steel Lever Spring. Even In Rainy Days, You Don't Have To Worry About The Bike 5. Smooth Round Arc Shape, Won't Hurt Your Hands. Just A Gentle Push, And The Bell Rings Clearly 6. Easy To Install. Comes With Anti-slip Ring To Fix The Screws. During The Installation Process, There's No Need To Remove Them, And The Screws Are Unlikely To Be Lost 7. Suitable For Most Models On The Market, Such As Touring Bicycles, Racing Bicycles, Fixed-gear Bicycles, Electric Bicycles, Children's Bicycles, Retro Bicycles, Etc 8. Bell Decibel: 90 Decibels 9. Suitable Handlebar Diameter: 22.2 - 31.8mm 10. Suitable Vehicle Type: Round Handlebar Bikes 11. Material: Nylon and Aluminum Alloy 12. Size: About 6.7 X 5cm 13. Weight: About 39g (bell Body and 22.2 Spacer) 14. Packaging List: 15. - Bell X 1 16. - 22.2mm Pipe Diameter Spacer X 1 17. - 25.4mm Pipe Diameter Spacer X 1 18. - Screwdriver X 1 19. - Instruction Manual X 1 Easy To Clean And Maintain Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.