Sponge balls for magic tricks. They are approximately 4 inches in size. Please refer to the second image, which includes a 1-yen coin for comparison (the 1-yen coin is not included). I believe all four balls are the same product, but I'm not entirely certain. Please be aware that there may be a mix of different types. They are the typical rough and firm type found in imported goods (the kind that strongly rebounds when squeezed). As is often the case with imported products, some may have dents or lines from the time of purchase. They are used items, but I didn't handle them directly, instead, they were used in an effect where a large number of them appear. They will be shipped compressed. 4 inches 100mm 10cm