Red Comb Binding Spines 9/16-inch [pk of 100] 14mm Try Authentic Oregon Lamination Premium  Binding Combs. You'll be Glad you Did. RED 9/16" Plastic Binding Combs (spines) 14mm standard 19 loop design for typical 11" comb binding machines Material: quality PVC plastic Quality meets or exceeds all major brands (like GBC, Ibico, Fellowes, etc) but at generic pricing