Wipers are sealing elements which are used inHydraulic applications to obstruct all kinds of negative foreign particles togo into the cylinders. Standardized with the materials of high performance PU92 Shore A and NBR 90 Shore A. NBR wipers should be used in low or mediumapplications, but with its high durability against rupture and wearing. PUwipers can be used safely in all applications including heavy duty cylinders