Record dampers help acheive the proper outer edge pressure for optimum play-back
 
The Low Compression Damper is for use with flat standard thickness records. This will create the lowest amount of deformation in the record. If used with thicker records it will result in less deformation or clamping force at the outer edge. 
 
The Medium Compression Damper is for use with standard records which are warped enough to not achieve full clamping with a Low compression damper. It will generate more deformation and thus clamping force.
 
The Medium Compression Damper is also for use with 180 gram records. 
 
The High Compression Damper is for use with 180 gram records which are warped enough to not fully clamp with a Medium compression damper.
 
The High Compression Damper is for use with 200 and 220 gram records.