Our Magnetic Stir Bars are constructed of high quality magnets coated with PTFE. Along with individual sizes of polygon, octagon, and egg-shaped, two convenient assortments are available. Stir Bar retrievers also available. Additional Info: Magnetic Stir Bar, Polygon, Without Pivot Ring, 25mm X 8mm Package Size(L x W x H): 0.8 X 0.3 X 0.3 (IN) Categories: Hot Plate & Stirrer Accessories, Stir Bars HTS Code: 8505.11.0000 UNSPSC: 4.11224e+007 Country Of Origin: INDIA