12 oz Invertatop?, Standard Valvetop?6/pack53mm opening. Dispensing made easy. Unique design. Sanitation guaranteed. Fill and store "inverted" for quick and easy use. Dual openings - easy to clean and fill. FDA approved food grade polyethylene material. Leakproof "soft" polyethylene PefectFlex? for fast prep. Conveniently packaged for Cash & Carry. Sold in packs of 8 with 6 EA per pack.