1. Invisible valves minimize the volume of valves on wheels, to improve the whole balance and the gross appearance.
2. The stem is not on the body of valve, but designed as an extender(Exb-5-AL). To inflate your tire, you just remove the dust-free cap with a coin and install the extender. Then you can inflate through the extender just as usual way.
3. The design of invisible valves is popular in Europe for high end users, with high quality and beautiful looking demand.
4. SE-452-5-AL & Exb-5-AL is made of aluminum alloy, with much lighter weight than basic type, SE-452-1-Cu
5. Can be made with brass as well.
6. Rim hole fit : 11.5mm.

**SE-452-5-AL & Exb-5-AL is new security type. The pentagonal-holed cap must be removed by pentagonal extender Exb-5. The special extender can be attached to a key ring.