Sponge Hardness
Rubbers come with sponges with varying hardnesses. Harder sponges will give you more speed, but less spin. Softer sponges will let the ball sink in deeper, and generate more spin with less speed. Sponge hardness is measured in degrees:
| Soft | up to 35° |
| Medium Soft | 40° |
| Medium | 42° |
| Hard | 45° |
| Very Hard | 47°+ |
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