100 sided die for board games, D&D, etc. I designed this die because I wasn't really happy with the ones I could find for purchase. All of the ones I could find for purchase had uneven side sizes. In my mind that would lead to an uneven probability. This one works pretty well, the only down sides are that sometimes it does roll around a bit, and it takes a fair amount of very flat surface. Also, you do have to be right over the top of it to read the correct number, and it is a bit larger than your average die. The larger you print it, the easier it is to read the numbers and find the correct one. It seems to work the best when you tumble it over the outer ring instead of just rolling it in line with the ring. Be careful when you glue it together, alignment is key. Good luck, and happy playing!