QUALITY MATERIALS - Flexible polymer construction designed for professional use. Material can easily be cut with scissors to accomodate smaller projects. Great for business proposals, training manuals, brochures, and other binding projects. PRE-CUT COMBS - Each comb is 11 inches long and fits a letter-sized book, document, or binding project perfectly. TruBind combs make binding easy and cost-effective. PRE-SIZED COMBS - 50mm (2 in.) diameter to bind up to 425 sheets of standard 20# copy paper. Maximum binding capacity of 1-3/4 inches in thickness. STANDARD SIZE - 19 holes per 11 inch comb. This provides the holding and durability needed for most office binding projects. UNIVERSAL COMPATIBILITY - Recommended for use with TruBind Comb Binding Machines like the TB-C20A or TB-CD600B. Also compatible with other machines like GBC (CombBind), Tamerica, and Fellowes.