Super Strength: Each magnet can hold up multiple pictures, many sheets of paper or artwork，usually more than 15 sheets of A4 printer paper per pin. Size: 8mm dia x 3mm thick, They are very small - not taking up any room and extremely strong! Prefect size and easy to find. Unparalleled Magnet Quality: These magnets are 'rare earth' magnets with north and south opposing sides. They can easily be stuck together or removed without much effort. They have a lush chrome finish in silver. NOT for use on glass magnetic boards, and they DO NOT stick to stainless steel. Useful: These magnets are perfect at work for sticking receipts, tasks, papers or instructions against a magnetic board or at home for hanging art work or family photos against the fridge. Ideal for model building, for crafting, experimentation and fixtures of all kinds. Satisfaction Customer- If the items you received is defective, please inform us within 7 days upon receipt of item, we will replace another new one.