Our Hyper Realistic Weiner Valve Stem Caps Screw right on the Tire cap with an airtight seal than prevents rust and air leaks. Great for pranking poorly parked cars with veiny realism. Doesn't affect tire balance. Works on many different tires (car, truck, bike, motorcycle, etc). Easy and Fast Install Keep in your cupholder for quick on the go pranking. Dick prank gifts are the funniest, everyone knows this. Our various Pencil Valve Stem Caps Bulk allows you to buy any quantity needed. Give the gift of a penis tire to any Karen in your life. Keep a bunch of dick valve caps in your cupholder and wait for your prey.