Chart: Belt Weights
2″x72″ grinding belts are the workhorse of modern blade grinding. You might notice the letter codes that are associated with these belts. Here’s how I translate the codes (additions or corrections welcome):
| Letter Code | Material | Weight | Stiffness |
| JE | Rayon | Very Light | Extremely Flexible |
| JF aka J-Flex | Cotton | Light | Very Flexible |
| J | Cotton | Light | Flexible |
| XF aka X-Flex | Cotton | Heavy | Somewhat Flexible |
| X | Cotton | Heavy | Stiff |
| YX | Polyester | Light | Stiff |
| Y aka YY | Polyester | Heavy | Very Stiff |
| E | Paper | Heavy | |
| F | Paper | Very Heavy |