There are 19mm, and 3/4" dice. There are clear colors, opaque, sanded, frosted version, and there are different weights with the same size. Recently I purchase some used 3/4" Frontier casino dice off eBay. The 3/4", frosted purple dice were in pretty good condition, and after selecting 2 of the new new dice I noticed they felt differently from my usual 3/4", clear red, unused Wild Bills casino dice. They felt lighter, noticeably lighter. So I took a set of each to weigh, and the clear red dice weighed 19.3 grams, and the new 3/4" frosted dice, weighed in at 18.2 grams, a significant differance of 1.1 grams. I can not recall ever hearing or reading of a significant weight difference between two 3/4" dice. discussed. Also, how would this weight differance affect your toss and its outcome?