I am looking for a product. A while back I received a sample of a nice cassette for cryo storage of tissue. It was designed similarly to a paraffin cassette, but had no vents and had a screw cap closure instead of the hinged web closure of a paraffin casstte. It had a nice area to label similar to the paraffin cassette. I don't remember the company that supplied me this sample, and an internet search has not given me any information. Does anyone know what I am talking about, and where I could buy these? They would be perfect for storing our mouse brains. If not these then could you suggest an alternative? I don't like the cryo vials for this purpose.