Just got my backup 24cm mobius matrix clone from Popular Glass.... and it's smaller than what I have now. The entire glass piece is slightly smaller, but the mouthpiece is significantly smaller, and worst of all - I get water in my mouth. Useless! The GAS continues.... i'm done with these dewaar joints, this one doesn't even fit my dnail slim series base AT ALL (major wobble, no seal)... I wonder if I was sent a "B stock"? It was discounted by $10 due to a chip in a water tool from a previous purchase from Steven. Think i'll ask him about it, although i'm guessing this is pretty standard with cheap, china glass?