Simple brass bell with attitude. There's no substitute for a good old-fashioned bicycle bell when you really want other people to get out of your way. The Skull Bike Bell uses centuries old, tried and trusted technology: A compact brass bell with sprung thumb lever. Good and loud and guaranteed to startle the most oblivious cab driver. The subtle skull detailing is a nice warning for other road users that you mean business. A great gift for a Hell's Angel without a motorbike license. Cycle safely now you little hell-raiser you! Materials and environmental Metal (Mild Steel) Recyclable. Alloy made from a mixture of steel, iron and carbon. Metal (Brass) A sustainable alloy, made of copper and zinc.