Its thickness is specifically distinguished as follows:
Ultra-thin type: 6D, 8D, 10D, 12D, 15D, 20D.
Medium thickness type: 40D, 50D, 70D, 75D, 80D, 100D,10d, 120D, 150D, 180D, 200D.
Thickened type: 300D, 380D, 400D, 500D, 600D, 700D, 800D, 1000D, 1200D, 1500D, 1600D.
Ultra-thick type: 2200D, 2400D, 2500D, 2600D, 2800D, 3000D, etc.