Can't give five stars yet because I haven't used them, but they seem great. They are one inch thick and consist of four 1/4 inch diameter wheels. The mandrel is disassembled and you can use it in 1/4β, 1/2β, 3/4β or whole inch. If they work well, which I'm sure, I'll buy them again. Better than nylon. Soubi Bang Show, here I come!
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