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"Diamond" blades are specially designed for cutting small bones, plastic, hard tissues for use in cryostats. The coating is incredibly durable and able to withstand plenty of abuse. These blades are not recommended for general paraffin sections.
See link on top of this page to tungsten carbide "disposable blades". These and TC knives are best for very hard, resin-embedded specimens; these knives can cut undecalcified solid bone.
Samples are available on request.