Quick Product Facts - 24 wings per pack - Available in premium cloth (8 colors) - One size fits most books - Highly durable & conformable - doesn t require cutting or measuring - PH Neutral and archival-safe adhesive Why Use Book Wings?: Book wings are an excellent tool for preserving the top or bottom of book spines where book-repair tape would be hard to use. They are a must for any book binding repair kit! Want to know more about how to use these repair wings? Check out our blog post written just for you by Andrew Himself. Book Wing Material The Premium Cloth Book Repair Wings are produced from the same material as our Cloth Book Repair Tape. Here s everything you need to know about it: 1. It protects books longer because it has a high resistance to scuffs and abrasion due to its thickness (it s a hefty 13-mils thick; masking tapes tend to be around 5 mils thick). 2. It has superior binding strength because it s made of quality vinyl-coated cotton that has 45 lbs per inch tensile strength (you ll see the high thread count of the material when you cut a piece with scissors). 3. Its high conformability enables it to easily wrap around corners and curves while not cracking or becoming brittle over time (you ll see this happen in lower quality binding tapes. I personally shudder in church every time I see that messy duct tape cracking and peeling off the book spine it tried to fix). 4. Its archival quality means it permanently sticks and wont fade or yellow over time (the pressure-sensitive adhesive is ph neutral and acid free). 5. It looks sharp and professional. The non-reflective matte color doesn t lose its vibrancy over time because the color is impregnated into the cloth material.