MATERIAL]: Made of industrial grade nitrile rubber (NBR).
[SIZE]: Includes 32 common standard sizes from 3 mm I.D. to 50 mm I.D.
[SPECIAL STORAGE BOX]: Equipped with heavy storage box, the O-rings of different sizes can be separated and placed orderly.
[HIGH PERFORMANCE]: Industrial grade NBR has excellent oil and UV resistance, and its super flexible structure and ultra thick wall design make it durable.
[APPLICATION]: Piping, mechanical, hydraulic and pneumatic maintenance.