A head shop is a retail outlet specializing in paraphernalia related to consumption of cannabis, other recreational drugs, and New Age herbs, as well as generally selling counterculture art, magazines, music, clothing, and home decor. Products typically include water pipes (colloquially called bongs), roach clips, glass pipes, rolling papers, rolling machines, scales or balances, whipped-cream chargers (which contain nitrous oxide), blacklight-responsive posters, incense, cigarette lighters, and products claimed to give false negative results for drugs on urinalysis tests.