20-200Pcs Super Strong Neodymium Magnets 10/15/20mm X 5/10mm X 3mm N35 NdFeB Block Magnets Square Magnets Refrigerator Stickers

Size: 10x5x3mm 15x5x3mm 20x10x3mm Shape: Block Tolerance: ±0.5mm Material: NdFeB permanent Magnets Max Operating Temperature: 80 Celsius degree / 176 Fahrenheit degree Plating: Nickel+Copper+Nickel triple layer plated Notice: 1. The large neodymium magnets are extremely strong, and must be handled with care to avoid personal injury and damage to the magnets. Fingers and other body parts can get severely pinched between two attracting magnets. It is easy broken,please be careful. 2. Never place neodymium magnets near electronics 3. Neodymium magnets are brittle, and can peel, crack or shatter if allowed to slam together. 4. Neodymium magnets will lose their magnetic properties if heated above 80°C/176°F. 5. Keep the magnets away from children.