43 Bolts have new (Hollow Bolts) for metric stems these new bolts are heat treated and harden to ensure superior strength for extreme and normal riding conditions. The bolts also have a (Zinc plating) to help fight harsh weather conditions and our hollow bolts fit most of the (New Style) small hloe metric stems so! don’t worry kids these bolts kick ass. Here is a list of color ways the Hollow bolts are available in High Lighter Yellow, Bright Orange, Bright White, Burgandy, Purple, Mint Green and Brown. And there is aldo one last step the new 43 Hollow bolts go through and that’s the Powder Coating process which is our “Super Bake” process which helps prevent paint chipping when installing your stem bolts. Now go ride your bikes and have some fun.