S = 45-Piece Pack M = 80-Piece Pack. Premium Quality Material: Crafted from high-grade aluminum alloy, these bookmarks are lightweight, feature a smooth surface, offer a comfortable tactile feel, are ideal for sublimation printing, and are highly resistant to fading. Easy to Use: Transfer your designs at a temperature of 190–200degree(s)C (374–392degree(s)F) for 50–60 seconds. Please be sure to remove the protective film from the surface before use. Supports single-sided printing. Diy Creativity: These bookmarks support single-sided sublimation printing, allowing you to utilize sublimation technology to personally create unique, personalized bookmarks. Versatile Applications: An ideal gift for family, friends, and mentors perfect for birthdays, graduation ceremonies, and various holiday celebrations. They can also be used as keychains, gift tags, backpack charms, or photo inserts. Weight: 0.79 lbs.