INCLUDES Pendant and necklace chain in a black velvet jewelry bag. You can also choose just the pendant alone, to use on your own cord or chain. SIZE The necklace chain is offered in your choice of length from 16" to 36" (40cm to 91cm) MATERIALS The pendant is a zinc alloy casting. The necklace chain is 304 Stainless steel. ABOUT An Rx prescription drug (also prescription medication or prescription medicine) is a pharmaceutical drug that legally requires a medical prescription to be dispensed. In contrast, over-the-counter drugs can be obtained without a prescription. The reason for this difference in substance control is the potential scope of misuse, from drug abuse to practicing medicine without a license and without sufficient education. Different jurisdictions have different definitions of what constitutes a prescription drug. "Rx" is often used as a short form for prescription drug in North America- it's a contraction of the Latin word "recipe" (an imperative form of "recipere") meaning "take". Prescription drugs are often dispensed together with a monograph (in Europe, a Patient Information Leaflet or PIL) that gives detailed information about the drug.