The Dert Two in One Presta Valve Caps allow you instant access to your tubeless valves to top up with extra sealant or just replace a valve core. This handy pack also includes six spare universal valve cores so when it comes time to replace that old valve core you can be sure to have a some ready to go. Who's this item for: Anyone looking to bling out their valves with a handy core removal tool and have some spare cores to boot Valve cap type: Alloy with built in valve core remover. Materials: 6061-T6 aluminium Valve compatibility: These caps are compatible with all presta valves, be it tubeless or even on regular tubes. The cores are compatible with all tubeless valves that have a removable core. In the Box: One pair of Dert Two in One Presta Valve Caps 6 spare valve cores Pros: Awesome value if you are chasing a set of valve caps and/or spare cores. Cons: Nothing really