ARI fork gasket set The quality of their execution is accompanied by the unique nature of the material used (XNBR). Fork seals offer unique features and find their use in modern motorcycle and scooter forks: – Resistance to abrasion and high temperatures ARI fork seals are of the same quality and size as OE quality. This results in the best possible grip in all road and climatic conditions. Fork seals are used in everyday use, racing or classic cars.