We manufacturer really many style grinding discs and mainly as below 4 style suitable for different market ~
C: 2.5 reinforce net , two net in the discs' body and half net coated in grinding surface. The half net in the grinding surface can make the disc be more strength and suitable for heavy grinding task.
D: 3 reinforce net , this style with max safe performance and popular in EURO, America, Middle East. etc market. You can see the reinforce net mesh on both up and grinding surface.
Anyway, there are still many others style grinding discs for your choose in Blueshark product line ~