LSD, or lysergic acid diethylamide, is a potent psychedelic drug that is typically sold on the black market in the form of small square tabs of absorbent paper. The exact number of tabs in a strip of acid can vary, but most strips typically contain between 10 and 100 tabs. However, it is important to note that the potency of LSD can vary widely from tab to tab, so it is always important to test a small piece of the tab before taking the whole thing.