Description Specifications Borosil® Glass Stirring Rods are made of polished 3.3 borosilicate glass. Model: 9850309 Material: 3.3 Borosilicate Stirrer Size: 9mm x 255mm Color: Clear Overall Dimensions: 18.5" L x 18.5" W x 5.7" H Class/Quality Grade: Type 1, Class A