2 products in this product line Oblong Base (FVR) FVRa (BASIC) RD proInfo SPEC CHECK 40MM TUBELESS PRESTA VALVE FITS TO RIMS HEIGHT : UP TO 25MM FIX OBLONG RUBBER BASE NO VALVE ROTATING & PULLING-THROUGH RIM WHILE INSTALATION BETTER SEALS THAN CONICAL RUBBER BASE (SURFACE CONTACT BETWEEN RUBBER & RIM BED) REMOVABLE VALVE CORE FIT 6.5 - 7.5MM VALVE HOLES REPLACEMENT VALVE FOR OE TUBELESS-READY RIM DT SWISS/GIANT BICYCLES FVRb (ADVANCED) RD proInfo SPEC CHECK BETTER FLOW & LESS SEALANT CLOG LARGER INTERNAL DIAMETER THAN FVRa FIX MODIFIED OBLONG RUBBER BASE BETTER SEALS THAN FVRa NO VALVE ROTATING & PULLING-THROUGH RIM WHILE INSTALATION 50~200% Stronger valve stem MADE FROM SOLID EXTRUDED ROD, NOT HOLLOW TUBE Exellent corrosion resistance PASSED *NSS 336 TEST SUCCESSFULLY lengths from 40 ~100mm FITS TO DIFFERENT RIM HEIGHTS REMOVABLE VALVE CORE FIT 6.5 - 7.5MM VALVE HOLES *NSS 336 Hours (Neutral Salt Spray Test) = 1680 Days (about 4.6years) at Beach Environment = 14 Years at Natural Environment.