I have a thought on this. It makes good sense from a production stand point if you think about it. What they are probably doing is taking an out of spec object ball and reducing it in size and using it as cores for the coin op cueballs rather than producing a new core from scratch which would just make them cost more, and reduces waste. I would guess that the culprit causing the cracking and chipping off is that magnetic flake layer, which is not whole resin like the rest of the ball, and therefore can't possibly bond the same way. Just my 2 cents.