Thay are about nickle size. George has about 20 more but they were at his house not at the store. He said he was going to get some larger ones in but I don't know when they are due to arrive and he usually holds onto them for a couple of weeks before he puts them out for sale. I would call ahead to see what's available unless you are going anyway. He also had some really nice quater size+ Manacapuru (Red Sholder?) Sclare but I don't know if he wants to part with those. The Altums are Rio Atabapo.