I imagine they're referring to the blades marketed for cutting up samples to put under a microscope. They're commonly sold in packs of 250. Examples: https://

I imagine they're referring to the blades marketed for cutting up samples to put under a microscope. They're commonly sold in packs of 250. Examples: https://www.fishersci.com/shop/products/razor-blade-uncoated/50366009 https://www.fishersci.com/shop/products/razor-blade-uncoated... https://www.emsdiasum.com/microscopy/products/preparation/blades.aspx https://www.emsdiasum.com/microscopy/products/preparation/bl...