Puritan Medical Product Hospital Economy Tongue Depressor 6-in L x 2/3-in W, Wood, Biodegradable Handle, Birch has High Tensile Strength, Splinter Free Edges This economy brand of adult size blade is made of white birch which is naturally biodegradable. It is available non-sterile and sterile depending on the application. Primarily used in oral patient care. Oral patient care and examination. Certificate of compliance available with each shipment upon request. FDA GMP s. ISO 13485:2003. ISO 9001:2008. Biodegradable handle. Birch has high tensile strength. Splinter free edges. Non-sterile.