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With any performance engine, it is necessary to up proper valve geometry to get the best performance and life out of your engine.   

You can use these shims to adjust the height of your rockers to correct the rocker tip roll/sweep pattern onto the valve.   
This can be thought of as how the rocker "sweeps" across the valve face and back.

This can be especially helpful in applications where you mill your heads or block to restore original geometry. 

These kits contain x30 shims of the following sizes: 

• x10 - 0.010" (ten thousands of an inch)  
• x10 - 0.015" (fifteen thousands of an inch)  
• x10 - 0.030" (thirty thousands of an inch)