UltraCruz® Sterile Pestle for Cell Strainer improves manipulation of material in a strainer during use. A pestle length of 5.5 inches allows for convenient hand manipulation. The convex pestle head has a molded textured surface to better manipulate slippery material in the cell strainer. These pestles are primary made of polypropylene and come individually wrapped. Pestles are RNase and DNase free.