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These special rulers are fabricated from a chemical resistant plastic which can be sterilized using ethylene oxide or alcohol.
By its nature it is nearly indestructible and extremely flexible. 0.5 and 1CM gradations are engraved 0.30 deep and filled with a special flexible radiopaque paint. These flexible rulers are available in two thickness of 1/16" and 1/8" and provide lasting readings on the x-ray.