I bought this cheap way to extract cells from small tissue samples. Glass counterparts cost several hundred dollars, so I went for a much cheaper product because it was worth it. They are not as efficient compared to the grinders you find in the lab but you will still get significant cell dissociation. This is one of my favorite finds, the grinders are easy to keep sterile and work well with a standard 1, 5 ml tubes . exactly 1.00 ml of liquid. When you insert the grinder, the liquid rises to just below the lid. I don't know if it's smart or lucky, but it adds charm to the products.