Hi, Dennis: (Great name, by the way!)
The dice are 0.75" / 19.05 mm. Midwest is the number one supplier of casino dice worldwide, so the size and weight are very precise. To keep the material perfectly clear and avoid wasting time and material, their manufacturing is done in a "clean room" environment that looks like a lab. So they don't call them "Certified Perfects" for nothing!
We started selling these dice in February, 2018. The offer and prices in the original post are from over four years ago. Midwest's wholesale price is likely higher than those 2018 PCF discount prices now, and may even be higher than my retail price. (I haven't checked recently.)
The dice now sell on our retail website for $14.95 per stick. We have Certified Perfects both with or without the Key West name on the "2" spot. ("Key West" Certified Perfects come in red or blue. The plain dice are available in red, blue or green.) The "Key West logo dice" are here:
https://www.pokerchipforum.com/threads/new-at-the-key-west-key-west-logo-dice.28960/
When you have enough posts or time to send PMs, let me know what you'd like to buy. I will always do whatever I can to get you the best price here on PCF.