I got these a number of years ago:
Got mine customized with quite a few large denomination chips, so my 500 chip set is adequate for even a 20 player tournament (with rebuys).
They're a nice quality clay composite chip, with no metal slug in the middle. They make a nice sound, very similar to real clay chips. The high pitched "CLINK!" from the crappy metal slug+plastic chips really makes me cringe.