This is an OEM Sparco Plastic Binding Spine, designed to work with Fellowes, GBC, and other compatible binding machines. It features a durable construction that will not scratch, chip, peel, or discolor, ensuring a professional appearance. The spine holds up to 200 sheets with a 1" diameter, making it suitable for various binding needs. Each box contains 100 spines, providing ample supply for your office or project requirements.