Stirrer Bars, Magnetic, Set 1, PTFE • Supplied in lidded box. • Contains:- a) Pivot Ring : Two each of 12×4.5, 25×6, 45×8, 60×9.5 (mm) b) Oval : Two each of 20×10, 25×12, 35×16, 50×20 (mm) c) Micro : Two each of 7×2, 10×3 (mm)