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Packing kit: 8 pieces (6 mm × 300 mm) These glass rods are made of borosilicate glass: high hardness, high melting point, colorless and transparent Perfect for mixing mixtures Widely used in chemical testing and living drinks and kitchen applications. Note: The length of the stir bar is the hand size, which may vary from 0.1cm to 0.3cm, but it does not affect the use.Quality is great. Zyanercommitted to providing customers with quality products, the best customer service, your satisfaction is our aim, if you have any questions, please contact us to get a satisfactory answer.