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Premium Triple Nickel-Copper-Nickel Coating & Stable Magnet Strength These round neodymium magnets feature a triple-layer nickel‑copper‑nickel composite coating. The glossy protective finish delivers excellent rust, oxidation and demagnetization resistance, keeping magnetic force steady for long‑term use. The powerful magnet maintains reliable adsorption without fading over time. Small 18×3mm Size, Strong Adsorption Capacity Each compact magnet measures 18 × 3 mm. Despite its tiny profile, it offers impressive holding power to secure photos, notes and lightweight paper stacks firmly. The magnets are precisely sized with tight quality control for consistent dimensions, ideal for detailed DIY and fixing tasks. Smooth Surface, No Residue & Surface-Friendly Removal The polished smooth surface leaves no marks, stains or imprints when you slide the magnet off fridges, whiteboards, photos or metal surfaces. It will not scratch or damage the attached objects. Gentle horizontal sliding is recommended to separate them and avoid cracking the magnets. 20 Pcs Magnets with Convenient Storage Box This set includes 20 pcs round magnets plus 1 matching storage box. The dedicated container helps you sort and store the small magnets neatly, preventing loss and making transport and organisation effortless for teachers, crafters and home users. Multi-scene Application for Office, Classroom & DIY Projects Versatile for daily organisation and creative work. Use them to fix photos, receipts, notes, posters and documents on fridges, whiteboards and magnetic bulletin boards. They are also great for model making, handmade crafts, school experiments and all kinds of magnetic fastening projects.