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 resistance and high temperatures ARI Fork Inge corresponds both in terms of quality as well as the dimension of the OE quality. This results in the best possible sealing results in all road and weather conditions. Fork rings are used in daily use in racing or even in classic cars.