In Razz, straights and flushes do not count against you for low, and the ace always plays low. The best possible Razz hand is 5-4-3-2-A, or 5 high, also known as "the wheel" or "the bicycle".
In Razz, straights and flushes do not penalize you for low, and the ace consistently plays low. The optimal possible Razz hand is 5-4-3-2-A, or 5 high, also referred to as "the wheel" or "the bicycle".