These tire valve-stem caps are shaped like a 9mm hollow point bullet. Machined from billet 6061-T6 aluminum and have a rubber o-ring installed for a positive seal. Note: Sold in a set of 4. 555-0217Regular price: $29.95Sale price: $14.97 www.realspeedauto.com Ph.631-563-7325 All parts listed are for the Ford Mustang unless otherwise noted. Copyright 2018 Realspeed Automotive Inc. All rights reserved.