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50-100 seems to work well. Usually 45 to 50. I'm no stropping expert, though.

That picture makes my 50000 look so lonely... :boohoo::w

Ray, pliability will NOT be a worry at all with these strops (probably in any thickness). My 50,000 is very very supple and flexible. As for the lower end models, I've handled a 30,000 and there...