SOG

Oil seal type CS (304), double metal cased, with a dust lip.

Material: nitrile rubber NBR.

Oil seal type CS (304),  with dust lip and with spring. 

Material: nitrile rubber (NBR)

Helix: 

The nitrile rubber may vary in color from the one shown in the picture, without this affecting the sealing properties of the oil seal.

Manufacturer:  SO GIANT OIL SEAL INDUSTRIAL  CO., LTD