This is an X-tiger bell. It's a bell shaped like an inverted bell. Its main feature is its simple design and very clear sound. It can be attached to handlebars with a wide range of diameters, from 22mm to 31.mm. * Spacers, bolts, and a hex wrench for installation that correspond to the handlebar diameter are included. Shipping will be on the same day or the next morning. #BicycleBell