These are mini-mini iron beads, a 2.6mm size, smaller than standard iron beads. They are packed in zip bags in 5g increments. There are approximately 500 beads per bag, but there may be some variation. The weight seems to differ depending on the color, so while we sell them as 5g, they actually contain 5.3 to 5.4g. Please understand that there may be some measurement error. This is a set of 25 colors. If you would like to add more, please comment beforehand. Additional bags (5g) are 60 yen each. Please refer to the images after the second one for the colors. Please note that this product does not include the bonus that comes with the 25-bag set sold separately. The colors may appear slightly different from the actual product depending on the device you are viewing them on. Thank you for your understanding.