Just got this little info from the folks of WTB.
INTRODUCING WTB’s TCS CUSTOMIZED INTEGRATED WHEEL SYSTEM
WTB’s new TCS (Tubeless Compatible System) Wheel System is the newest option for light-weight tubeless tires, rims and wheels which allows riders to fully customize their set up for specific terrain and riding style. Features include WT69 metal alloy, tubeless compatible rim with light weight rim tape, bladed WTB spokes with SwellBow, alloy nipples and a stainless steel cartridge bearings with dual labyrinth seals.
WTB worked with a team of professional riders and engineers to develop the TCS Customized Integrated Wheel System. The product development team included WTB President Patrick Seidler, head of Product Development Mark Slate, and pro racers Mark Weir and Jason Moeschler. The team successfully made TCS technology compatible with all UST, ISO and ETRTO standards, tires, rims, and wheels.
They sure look good…