All are single-sided eyelets made of brass ※ Clamp type This is a set. This is a surplus set of eyelets. Please check the images for the size and dimensions. The largest, size 32B, contains 4 pieces. The second largest, 30B, contains 10 unopened pieces. The third largest, 28B, contains 16 pieces. The above three were purchased at Okayadaya ※ I think they are probably discontinued now. #25 contains one unopened bag of 30 pieces and another bag with about 6-7 pieces. The item with the 950 yen price tag is size unknown, but it is probably #20 and has more than 30 pieces remaining. This is a bargain set, so there may be some errors in the number of pieces. It is very difficult to measure accurately, so please judge the approximate size from the images.