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I believe it is koto but i could be wrong. you might have to contact butterfly directly to find out.Anybody knows the outer layer?
I once again could be wrong but it could be due to tinyt differences in weight or like qc (although butterfly's qc is quite good) or maybe micro differences as there are going to be differences in two blades that are exactly the same e.g. tb alc comapred to another tb alc wont feel the sameThe blade is not fast for a Tamca 5000 modell so I thought it is perhaps due to the surface.