50 Pack Assorted Solid Rubber Stoppers, Acid and Alkali Resistant Stock Type_Stocked Heavy base with hinged cover Heavy base with hinged cover for protecting the interior mechanism the lightweight body producing virtual upright reduced images for safer per desk divergence demonstrations Pack of 50 solid rubber stoppers in assorted sizes provides acid and alkali resistance for comprehensive laboratory vessel sealing applications
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50-Pack Assorted Solid Rubber Stoppers, Acid and Alkali Resistant Stock Type_Stocked Heavy base with hinged cover