I ordered a 38. Blue Loxa III sponge. 2,1 mm with seemingly the same pre glue layer as the black national. 67,1 g with the glue layer and foil. 61,5 without. 45 g cut. The black 40,5 was 50 g cut. Hardness: about 1 euro degree softer than the 40,5. So definetly harder than 38. Finger press test...