just the weight is different

clay are heavier, and if you hit to clay chips lightly, there shouldnt be as much noise as with plastic chips

listen to the sound as they hit the table if you were to throw it up and let it fall. Clay should sound more…clayie,,, plastic should be more bouncey in a way and and a lot higher pitched. Also the weight clay should be heavier. if it is a powder when you shave the edges i think they are clay. I would say clay…i have had plastic before but switched to clay as i got more professional. I think you have clay. Plastic can crack easily try to crack it with your hand, clay you shouldnt be able to just with your hands. you do have clay=85-90%sure but you test it

Very carefully

Don’t be shaving on them anymore. They are valuable. My father’s collection is worth over half a million. Leave them alone until you know what you have. There are poker chip conventions routinely. Try attending one to learn more about chips. Bring your collection and let the traders gander at them. Don’t act dumb. They’ll treat you well and they’ll be honest about what you have. But, poker chips websites thoroughly cover every chip that has ever been made anywhere in the world and will list their “value”. Don’t go by those values too much because for that one missing chip, a trader will pay whatever it takes to have it. I may be talking through my nose, though, if you’re already a collector, but just in case you aren’t, you should know this stuff. Have fun. Poker chip collecting and trading is the hobby of kings. You’ll get to meet really interesting people.