Neodymium magnets, 3mm diameter x 1.6mm thick, quantity 30. [3mm x 2mm specification], but the actual measured thickness was approximately 1.6mm, so it is listed as the measured value. There are individual differences in size. We will provide a quote for your desired quantity. Please inquire. (Up to 5000 pieces depending on stock availability) Applications: Model making such as plastic models, crafts, etc. *Neodymium magnets may have scratches or dents from the manufacturing process. Please understand beforehand that these are within a range that does not affect practicality. ◆Please use if you are 14 years of age or older. ◆There have been several serious accidents where children have swallowed them and required abdominal surgery. To prevent accidental ingestion, please keep them out of the reach of children.