Black Comb Binding Spines 3/4-inch [pk of 500] 19mm Standard 19 loop (19 ring) design for typical 11" edge comb binding equipment color: BLACK, material: PVC plastic 3/4" plastic binding combs / spines Meets or exceeds all major brands (like GBC, Ibico, Fellowes, etc) but at generic pricing Trust Authentic Oregon Lamination Trademarked  Premium Binding Combs. Accept No Less