One of the great things about the gripperclips in our Sparkleball Kit is that they’ll work on just about any plastic cup, soft or hard — which is why we also sell them separately.
These hard cups in Halloween colors are solo-shaped but just a tad different size. I used Carl Boro’s Chinet recipe 14-11-6-1, and gripperclips made it easy to put together. (You can also use hot-glue for Hard Cup Sparkleballs.) Love how shiny hard cups are, even if they are more fragile.