General Type Multi-Well Cell Culture Plates with flat bottoms are sterilized by gamma radiation for immediate use. These tissue-culture treated crystal-grade virgin polystyrene plates with multiple wells are ideal for adhesion and suspension cell culture, primary cell cloning, viral titrations, and cell fusion. Lids fit one-way with raised well rims reduce cross contamination risk and are shaped to facilitate stacking and handling. The plate edges and lids are designed to reduce evaporation. Alphanumeric well identification in paper overwrap packaging.