So, alright, bad feedbacks about Duret Tricks series so those are out...
I wrote to K2 and according to them 169 fujatives are 3.4Kg/pair and according to Dynastar website, 175 TMs are 3.5Kg/pair. But I only hear things like "K2 is on the heavier side" or "TMs are lighter"... so I don't know...