Bike bells generally look sound a bit ugly. But why What if they looked sexy sounded like an angel playing a glockenspiel A bell with a beautiful tone, but also a remarkable style and choice of materials that embodies a rider's personality. The Small Oi fits 22.2mm bars e.g Mountain bike near the grips , BMX some old commuters. The Large Oi fits 23.8 to 31.8mm bars e.g. drop bar road bikes and some cruiser / commuters. Please make sure you know where on your handlebar you are going to place the bell grips or stem before you order as you may need a different sized bell. Small Oi fits 22.2mm bars e.g Mountain bike near the grips , BMX some old commuters Large Oi fits 23.8 to 31.8mm bars e.g. drop bar road bikes and some cruiser / commuters aluminium, brass, copper, and black Oi bells 3 x each finish