Silicone bar diameter 8mm.

Use for Inner 8mm Hard Tube.(8/10mm or 8/12mm tube)

Silicone bar diameter 10mm.

Use for Inner 10mm Hard Tube.(10/12mm or 10/14mm tube)

Silicone bar diameter 12mm.

Use for Inner 12mm Hard Tube.(12/14mm or 12/16mm tube)