20 x 20cm Notched Glass Plates 2mm thick
https://www.daifengwang.com/shop/166-vs20ng-20-x-20cm-notched-glass-plates-2mm-thick-9870
https://www.daifengwang.com/web/image/product.template/9870/image_1920?unique=1e82431
This x 20 is guaranteed a 20cm with the use of Glass and directly supplied to your lab by Gentaur's warehouse.
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