You can get the valve cores with or without a valve core tool. They fit all Schrader (Universal) valve stems. Made of zinc alloy.
(10) Dill 5411 Valve Core Screwdriver Tools - Insert And Remove Tire Valve Cores
(QTY 4) ALLIED 45505: Standard Short-Type Tire Valve Cores 3/4-inch x 0.17-inch
100PCS Premium Tyre Tire Valve Cores, Nickel 0.75 × 0.2 inch, Red&Silver
2 PCS Tire Valve Stem Removal Tool with 20 PCS Valve Cores, 10 PCS Tire Valve...
Tire Valve Stem cores bag of 100
Convenient Pack of 100 Valve Cores for Tire Repair and Replacement
