Detail:

Name:custom rubber backup ring

Material:VQM,EPDM,NBR,CR,NR,IIR,etc

Hardness:70 shore A. 

Color: Red,Green,Black...etc

Backup ring, also known as the support ring, is a hydraulic cylinder or cylinder piston or piston rod on the support piston or piston rod movement parts, it can prevent the piston or piston rod in the process of movement and direct contact with the cylinder and friction, play a role in protecting the cylinder and piston or10 piston rod from being damaged.