(SC13/SD13) This package includes 100 pieces of 18mm black plastic binding coils with a 4:1 pitch hole spacing, suitable for binding 151-160 sheets of paper. The coils are made by James Burn and are brand new. They are perfect for organizing your office or personal documents. The coils are easy to use and provide a professional touch to your presentation. They are compatible with a variety of binding machines and are made of durable materials. The product is manufactured in Mexico and is of high quality. Order now to keep your papers organized and presentable.