Pack of ten 6 stoppers made of long lasting neoprene rubber. Blue color. Each stopper features two holes measuring 5mm in diameter. Manufactured according to sizes recommended by AS standards. Each stopper measures 25mm in length, has a base diameter measuring 26mm, and a top diameter measuring 32mm. The neoprene rubber construction is suitable for use with petroleum products, minerals, oils and fats, as well as most inorganic acids and bases. Resistant to temperatures ranging from -40 to 130C. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind.