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UB blocks are urethane, cylindrical and bright orange, yellow or amber in color (never black).These are available in one hardness (durometer) and compound. K2 blocks are urethane, wedge-shaped and blue in color. Available in one hardness (durometer) and compound. WB and CB blocks are black. WB blocks are wedge-shaped, while CB blocks are cylindrical. For WB and CB blocks, the compound and hardness (durometer) is coded at the end of each block. Natural and Nitrile rubber blocks have a painted dot on the end to identify both the material and durometer.  Most of these blocks will have the letter "K" molded on the end. SBR blocks have the letters "SBR" molded on the end along with a hardness (durometer) code.
- 50 durometer has the marking SBR 1
- 60 durometer had the marking SBR 2
- 70 durometer has the marking SBR 3
- 80 durometer has the marking SBR 4 WB and CB block material and durometer must be specified at the time of order.
These are best determined by a torsional analysis. Please refer to our catalog for more information.