There are four sizes, with the following approximate diameters: Extra Small: ~1.5cm Small: ~2cm Medium: ~3cm Large: ~4cm "Approximate" means there may be slight variations in shape or a few millimeters of error depending on the measuring angle. Please understand. I apologize, but I haven't counted the number of pieces inside as there are many. If you would like them counted, I can do so for an additional 250 yen on top of the listed price. For individual sales, the price per pack is 600 yen for each size (Extra Small to Large). If you purchase all four packs, the total price is 2,400 yen. For customers purchasing multiple pieces from each size, I apologize, but there will be an additional 250 yen for counting the pieces, and the price may increase depending on the number of pieces purchased. I apologize for the long and somewhat disorganized text, but thank you for reading to the end. Please feel free to ask if you have any questions.