Tissue culture-treated inserts are designed for use with horizontal and vertical diffusion chambers. A modified Transwell™ permeable support containing a 12mm diameter 0.4µm pore polycarbonate or polyester membrane supported by a detachable ring. Once cells are grown to confluence on the Snapwell™, the ring can be placed in a vertical or horizontal diffusion chamber. 1.1cm2 growth surface area. Polystyrene. Sterilized by gamma radiation. Packaged in 6-well clear plates with round well tops and flat bottoms.