Oi Prima bike bell features our signature wrap-around bell design and our newest innovation - WAVETEK hammer technology. The whip of this new hammer design helps to create a beautiful and consistent bell tone, while being built for robust and long-lasting use. Available in two sizes to ensure the correct fit on your handlebar. Our signature wrap-around design. WAVETEK - the latest in bell technology. Built to last with a robust spring design. Beautiful tone that&';s loud but pleasant. Available in two sizes for a perfect fit (see below).