This product is designed for the streamlined collection, transport, and processing of biological specimen. The microbial lysis tubes and bead beating tubes are pre-filled with DNA/RNA Shield and a lysis matrix tailored for tough-to-lyse-sample inputs from tissue to microbial samples. Bead sizes include 0.5 mm & 0.1 mm and 2.0 mm. DNA/RNA Shield Lysis Tubes (Microbe) https://www.microbialtec.com/dnarna-shield-lysis-tubes-microbe-item-18.html