Juicy Nipple Valve Cap and Valve Stem Set comes with 48mm valve stems. The dust cap not only keeps your Presta valve from dirt, but also doubles as valve core remover. Tire Insert Compatible: Presta valve stems feature four bottom holes, ensuring smooth airflow and optimal performance even with tire inserts. Durable and Lightweight: The caps and valve stems are both crafted from 6061 alloy, featuring a tough anodized finish for lasting performance. Easy Installation: A hex keyhole at the valve stem's base ensures a snug and secure fit when tightening onto the rim. Boost Your Style: Elevate your ride with Juicy Nipple! With a selection of 9 colors, you can simply match your style and let the bike reflect your unique personality.