The Micro-Mesh® Soft Touch pad set comes in 9 different grades:

• 1500 (30 Micron rating)
  
• 1800 (15 Micron rating)
  
• 2400 (12 Micron rating)
  
• 3200 (8.5 Micron rating)
  
• 3600 (8 Micron rating)
  
• 4000 (5 Micron rating)
  
• 6000 (4 Micron rating)
  
• 8000 (3 Micron rating)
  
• 12000
  

Each pad is colour coded for easy identification.

This Micro-Mesh kit contains 9 double-sided Soft Touch Pads (3" x 4") of cushioned abrasive cloth material mounted on 4 mm foam.

I prefer to buy these larger pads for finishing my pens, cutting them in half. This gives me a perfectly usable pad more cheaply than buying the 2"x2" pads.