ARI fork seal kit The quality of their execution is coordinated by the unique nature of the material used (XNBR). Fork rings have unique properties and are used in modern forks of motorcycles and scooters: – Abrasion and high temperature resistance ARI Fork Inge corresponds both in terms of quality as well as size to the OE quality. This results in the best possible grip results in all road and weather conditions. Forcella rings are used in daily use in racing or even in vintage cars.