The AO American Optical Microtome Knife Blade is a high-quality, precision tool used in the field of microscopy. Made in the United States by American Optical, this microtome blade is designed to provide clean and accurate cutting of samples for microtome machines. With a focus on precision and quality, this unit quantity of 1 blade is ideal for researchers and professionals in the medical and lab equipment industry. Ideal for achieving consistent and precise results in cutting tissue or other materials for microscopy analysis. Smoke and pet free household. We combine shipping on multiple orders!!!