niceEshop(TM) 1Pair Motorbike/Bike Handlebar LED Light -Red Light Material: CNC aluminium alloy + contracting elastic rubber + SMT LED light. Condition: brand new. Size: head diameter -3.5mm, length -7.5mm, insert rod diameter: 1.7cm. Powered by 3 x AG10 batteries (included). Three modes of flash frequency controlled by the button in the middle of head.