Belts are resin bonded diamond on heavy bond cloth. 6 x 1.5, 6 x 2.5, 8 x 3 and 3 x 41.5 inch sizes are available in your choice of grit.
6 x 2.5 inch belts in 100 mesh or finer are $58 each and 8 x 3 belts are $87.50 each in 100 mesh or finer. Generally diamond will last 50 times longer than a silicon carbide belt. I switched from 3M to Eastwind belts a number of years ago and have been very pleased with them. They are made right here in the USA and are first quality; not some overseas cheapies with skimpy diamond!

   All diamond products need a slight break-in period.  This is especially true with 6 micron (3000 mesh) and finer diamond.   This happens due to the diamond being microsized.  The diamond is separated by a water process to size the particles.  When the particles dry, they sometimes form a vacuum between each other.  The result is deep scratches until the vacuum is broken down by use.  The way to dress the disks and belts is to run a piece of fine silicon carbide over the surface for five to ten seconds.  This breaks down the vacuum and should eliminate the scratches.  Be sure to follow this procedure using lots of water to flush the disk or belt. This should take care of the scratching problem.

IMPORTANT INSTRUCTIONS

To insure maximum performance and long life from your new diamond abrasive belt and disks please follow these instructions carefully.

The diamond abrasives must be used wet.The more water coolant used the better.This is the most important factor in using the resin bond diamond.
Do not force sharp edges into the abrasives.This will cause tears in the backing and can be dangerous.
Use light to medium pressure for best results and to ensure long life of the product.
Use the whole surface of the abrasive, never just one spot.Take advantage of the fact that the entire surface is coated with diamond abrasive.
There is a short break-in period.Also, use a light touch at the beginning since a new surface will cut much more aggressively.
Be sure a belt is completely dry before storing in an enclosed space or plastic bag.