What are the dimensions of the square variety?
These are 25mm square. They come in a square plastic capsule.
These are great. What's that 125 sat bar? is that for sale too?
That piece is a 125,000 Satoshi copper bar. They can be funded or unfunded. I have a whole product line of trade units. They range from 1g silver all the way up to 5g 14k gold with more denominations coming. I also have some brass pieces sprinkled in there. PM for a list of all products. I'll keep this listing related to the 10g silver pieces.
here are some pictures I could find.