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@TheBrick(Tommy)
double butted - thinner in the middle e.g 2.0 mm - 1.8mm -2.0 mm
trippl butted - thinner at the middle and and extra thick at the elbow e.g 2.3 mm - 1.8mm -2.0 mm
single butted - thicker at elbow thiner along the rest. e.g 2.3 mm - 2.0 mm - 2.0 mm