Ensure that your finished document is both fully functional and long lasting with these Mead CombBind Binding Spines Black, 19-hole, 9/16" plastic spines bind up to 105 sheets Permanent spines allow pages to lay flat, helping to ensure the final product is manageable and easy to read Durable plastic spines won't scratch, peel, chip or discolor for long-lasting use; For use with letter size documents With 125 spines per pack, you can keep plenty on hand to use for all your binding projects; Compatible with any comb-style binding machine