Bovine Type I Collagen Sponges 4mm from Innovative Research is a Type I collagen sponge, engineered to maximize surface area for cell attachment, growth, and migration and facilitate the flow of cells and nutrients, using an interpenetrating column porous structure. Biodegradable long term, the cross-linking still offers the strength suitable for both short and long term tissue culture. This product's 4mm diameter fits 96 well culture plates. Ready to use; terminally sterilized. Suitable for tissue engineering applications.More Details: Collagen Source: Type I, Purified Disc Diameter: 4 mm Disc Thickness: 1.5 mm Pore Size: ~200 um, range 100-400 um Purity: >=99% Sterlilty: No growth via USP modified method Sterilization: Irradiation Endotoxin: <=1.0 EU/mL via the LAL method Storage Conditions: Store at room temperature. Shelf life is a minimum of 6 months following date of receipt. For research use only. At Innovative Research, we provide reliable, consistent products that deliver reliable, consistent results.Stated concentrations, if any, are representative and can vary from lot to lot. Please see the documentation enclosed with your order for actual concentrations and contact us if your research necessitates specific concentrations.