This article is from the Pool & Billiards FAQ, by Bob Jewett with numerous contributions by others.
This scale for tip hardness can be found in Mueller's catalog.
These tips are rated on a scale of 1 (softest) to 4 (hardest).
Individual tips vary.
Elk Master: 1
Blue Knight: 1
Royal Oak: 2
Triumph: 2.5
Chandivert Match: 2.5
Triangle: 3.5
Chandivert Crown: 3.5
Chandivert Champion: 3.5
Le Pro: 3
Chandivert Rocky: 4
 
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