Rog, Your two chips are made of plastic. The PO DO chip has a little more of a composition with some thing else, as you can tell it makes a different ring when it hits the table. There is a similar design that I show that you will find in Dale's book. That one is a clay composition chip. I think the white interlocking chip I show is like yours. my red one has some marbling and is much cheaper feeling and sounding. If you collect plastic chips you will find that the weight and quality of manufacture is all over the place. Most people on the Chip BB don't collect the cheap plastic stuff, but I collect all types of manufacturing styles. Like beer, the only bad chip is the one you don't get.