4.Inventories

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Inventories are comprised of unprocessed tissue, work-in-process, Avance® Nerve Graft, Axoguard® Nerve Connector, Axoguard Nerve Protector, Avive^® Soft Tissue Membrane, AcroVal Neurosensory and Motor Testing System, Axotouch^® Two-Point Discriminator and supplies and are valued at the lower of cost (first-in, first-out) or net realizable value and consist of the following:

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For the six months ended June 30, 2019 and 2018, the Company had adjustments to the provision for inventory write downs of ($95) and $582 respectively.