4 different sizes：100 pieces of each size(6mmx2mm,5mmx2mm,4mmx2mm,3mmx2mm).We offer customizable magnets that can be personalized with your own photos or messages, making for a perfect gift or a cherished keepsake | Rust Resistent and Durable: Ni-Cu-Ni (Nickel-Copper-Nickel) plated on the surface, provides rust resistant protection and looks shiny, greatly increase the longevity of the Magnets | Excellent Mechanical Strength: Compared to others, this mangets have excellent mechanical strength and is hard to break. Although it is strong, it is not as strong as iron, Please handle it with care | Magnets for All Occasions: There are various uses depending on the idea, such as household use, office supplies, factory production sites, warehouses, educational activities, etc | Customer Satisfaction Guaranteed: We take pride in providing top-notch customer service. If you have any issues or questions, our dedicated team is here to assist you