TubeRoller with 10 Rollers, 115V, Cat. No.: BM-R3010, TubeRollers are designed for the gentle, thorough mixing of variety of containers, including Vacutainers™, bottles, test tubes, centrifuge tubes and roller bottles. Both models (5 roller and 10 roller) operate at a constant 38rpm, chosen as the optimum speed for the broadest range of mixing requirements. Gentle rolling motion,Smooth 5° tilting notion,Accepts tubes and bottles from 8mm to 200mm