... shock block 1.size: any sizes are optional. 2.material:NR,NBR,CR, EPDM 3.hardness: 40-75A 4.tensile ... strenght:5-20MPA rubber shock block Features: 1) Material: NR,NBR,CR ... Dampen vibration, prolong machine life, good rigidity and protection 4) Professionally customize all kinds of rubber produc6ts in accordance ... customer’s drawing and demands. rubber shock block