USB Powered Handlebar Heated Grips for Motorcycle and BicycleUltimateaddons Clip On Heated Grips are a great solution for users who dont want to make a permanent change to their current grips. Powered by a simple USB portable battery bank (not provided with the product) the grips will keep users hands warm on their journey. The simple clip on form makes it easy to remove and attach the existing grips. To ensure a good fit to the bars, simply measure the circumference of your grips by wrapping a tape measure