Special roller silent, ID 9 mm (tungsten carbide tip)
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Black rubber with black plastic shell create the best special roller silent tip.
Insert: alpine tungsten carbide (widia) tip.
Tungsten carbide (WC) is a chemical compound containing powder forms of tungsten carbide and cobalt which are during a specific sintering process fused together into a dense "hard metal".
Tungsten carbide (widia) is much stiffer than steel, so this tip is extremely durable.
ID is 9 mm.