The guee b copper bike thumb bell is a copper made bell which can be easily installed onto any bike the bell has a universal design and so can be mounted onto both the right or left side of your bike dependant on your dominant hand this bell by guee has a special camp which provides a strong clamping force for a sturdy grip and despite only being 19g still lets out a loud sound guee b copper bike thumb bell features compact only 19g copper bell with loud sound aluminium clip bracket