Stairville Snap Protector Ring Black 100 Pieces; black truss protection ring; The Protector Ring is mounted once on the Truss main tubes and protects it from unwanted scratches; The rings avoid prevent direct Contact between the floor and the truss, what protects the surface and avoids noise; fits to trussing with main tube diameter from 48 to 51mm: Material: PA6 (nylon); Colour: Black; Weight: 9.1 g;