Radiation-sterilized polystyrene dishes available with straight and beveled ridges and flat, clear lids for distortion-free viewing (25 dishes per sleeve, 20 sleeves per case) Top and bottom edges are squared off (not rounded) to provide a firm, sure grip - Edges are squared and bottom is flat so medium spreads evenly over the entire dish bottom
- Three venting ribs built into the underside of the lid prevent buildup of condensation that would drip onto the media
- Lid skirt is flared just enough so that it can be replaced quickly after streaking
- Lid fits loosely enough to provide air exchange, yet it's tight enough to reduce risk of aerial contamination
- Place lid upside down on dish to close off dish from outside environment
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