How Fast Time Flies' refill packs of protector pages are made of premium ultra-clear polypropylene. Each set of 10 sheets holds 20 digi-scrapbook pages, and are designed to fit into standard scrapbook albums. The extension posts included in each set are designed to expand your album. You'll need these refills and extension posts as your digi-scrapbook album grows. By Maude Asbury.