yes thyre limited to about 250,000 pieces...culling the bad ones and fractures prob is figured to be about 2500 or so mibs...these were made at the plant by private investors under contract...the cost of the glass and aventurine and lutz is pretty expensive.....the gold lutz is $400.00 an ounce ....the 250,000 number is not extensive when you think that thats total for one day and when marbles were really beign made say in the 50S a plant could produce 2-4 million mibs in a day...i have contactcs for these runs ....let me know if youd like some....they go for about 10$ each..the more you buy the cheaper they get......they also have boxed sets for a nice price.,...