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Base moulds for use in histology feature smooth interior finishes and rounded corners to facilitate specimen removal. These moulds are disposable or reusable, fabricated from specially formulated plastic or stainless steel, and certain models have wings to ensure level embedding. They are designed for use with tissue-processing/embedding cassettes, and disposable base moulds are designed for zero flash. Moulded for a tight fit around contained cassettes, these moulds prevent excess paraffin from adhering to the sides of the cassette.