Of course, at DHS you can buy H3 or NH3 hardness 37, 38, 39, 40 and 41°. The difference is in the thicknesses for H3 and NH3. In addition to 2.15 and 2.2 mm, DHS also offers 2.1 mm for the NH3, while only 2.15 and 2.2 mm are available for the H3. Then there are other DHS rubbers, where there are...