Nitrile is made from an allergy safe compound that feels a lot like latex but is much stronger and is more comfortable to wear. It is a great combination of strength, comfort, durability and dexterity. Powder free gloves go through an extra process of chlorinating the gloves to ease donning. These 3.3 mil are considered a medium grade option that is most popular with mechanics, machinists, sanitation workers, plumbers, HVAC technicians and are food service safe. They come in sizes S, M, L and XL. Each case is 10 boxes of 100 (1000 per case).