dry ageing is different than hanging beef. dry ageing is a more rigorous humidity controlled environment with less moisture which discourages mold growth. also, some use cheesecloth and change it when mold grows. others appear not to put anything on and just trim it off. real dry aged beef definitely has a different texture and taste. i hang mine for 18-21 days if possible. once cut, air is meat's worst enemy. some of my customers request shrink wrap. i never shrink wrap mine, and just go with the double wrap with the saran like wrap with the paper wrap. haven't seen one frost damage section anywhere yet and i've had mine in the freezer for a year. i just had a broiled flank, 5 minutes on side one, 4 on side two and medium rare inside. i gotta say, it was more tender than some new york's i've had and the juices were awesome. with the tenderness genes, the difference is more dramatic versus no tenderness genes the less time you hang it. the more the meat is hung, the more they converge.