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8 Piece mixing set includes THREE beakers (400ml, 600ml, and 800ml), ONE glass stirring rod (8 inch), THREE Magnetic Stir Bars ( 12x7, 25x7, and 35x9mm), and ONE watch glass (100mm). Griffin Low Form Beakers are Type I Class A - 3.3 Borosilicate Glass. Double Scale, Heavy-Duty, beaded rim and a spout designed to have excellent pouring characteristics., white marking spot, and uniform wall thickness throughout. 3.3 borosilicate is the highest level of inert glass available. Designed from ASTM Specification E960, Type I requirements. Glass Stirring Rod is 203 X 5.5mm. Stirring rods are made of soft flint glass, with both ends fire-polished and rounded. Watch Glass: 100mm in diameter, made of flint glass.