If they are anything like Abbiati chips, which I'm sure they are being BJ's and all, I can tell you that they are indeed quite nice and stack extremely well.
Foxwoods roulette has chips just like these, I'm pretty certain they are the same thing. They do stack well but they are very light! Probably around 7g
These are the roulette chips from table 7 of the Grand Casino in Biloxi. They are Bud Jones chips. Very nice chips and all, but only 5 of the 8 colors from the table. The description is a little odd -- One sentence mentions 100 chips the next mentions 270. In either event, not worth more than a buck a peice. So a little overpriced.