OKO Magic Milk High fibre Tubeless Tire Sealant The choice of top MTB/XC/Road/Downhill/CX teams. Handles highest and lowest pressures. Lasts longer, seals stronger. Allergy-free. The new high in fiber formula is faster acting with larger blue granules suspended in its milk, making it better suited to quickly seal low pressure MTB, DH, XC, Cyclocross or high pressure road tubeless Tires.