Description: There are three common V-belts: classic V-belts (classified by size from A to E), narrow V series (classified by their 3V, 5V and 8V sizes), and light and low-power horsepower belts (classified by their sizes ) 2L, 3L, 4L, 5L). The corresponding toothed belts are classified with the letter X. For example, the classic V-tooth belt will be 3VX, 5VX, etc.