Mirrycle's Incredibell Brass Duet makes a traditional ding-dong dual-tone ring with the beautiful resonance of solid brass. Plus, its compact size lets you mount it just about anywhere on your handlebars. - Dome Diameter: 33mm (1.3") - Fits handlebars with 21.7mm – 24mm (.86" – .95") outside diameters

The Mirrycle mounts in minutes with the wrench that is included. The mirror is a 3" round, convex glass mirror with a wide field of view. The mirror is adjustable to any viewing angle. - Fits inside handlebars with 13.75mm – 22.5mm (.54" to .875") inside diameter

The louder version of the Original Incredibell. The Incredibell XL is a little bigger and comes with the same pivoting dinger. - Dome Diameter: 43mm (1.7') - Fits handlebars with 21.7mm – 26mm (.85' – 1.03') outside diameters