BioMaintain Collagen Bovine Membrane by Ousia is made from highly purified Type 1 bovine collagen sourced from the Achilles tendon. The proprietary manufacturing process of BioMaintain barrier membranes results in a unique combination of biocompatibility, extended barrier function, membrane integrity (for suturing and tacking), handling options and complete resorbability. Compare to the RTM and RCM6 Membranes. 100% resorbable matrix