Finish Line Multi Seal Tubeless Tyre Sealant is naturally non-toxic, hypoallergenic & safe for carbon fibre rims. Fiber Link technology makes this possible. Utilizing Du Pont Kevlar fibres, Fiber Link seals are extremely robust once they plug a hole. When a puncture happens, fibres rush into the wound & quickly stop air loss. As the tyre flexes while it is ridden, the Fiber Link mesh tightens & reinforces itself, creating a confidence-inspiring seal that will last ride-after-ride.