The Eisco Labs Polypropylene Test Tube Stand holds up to 6 test tubes with diameters up to 25mm, and includes 6 drying pins on the back for inverting and drying tubes after washing. The autoclavable polypropylene construction stands up to lab wear and is easy to clean between uses. Rack ships in either blue or white — color may vary. Designed for professional laboratories but equally well suited to science classrooms and household use.