Get a jumpstart on your next science experiment! Basic kit features borosilicate glass test tubes with uniform wall thickness for maximum heat transfer and chemical resistance. The 4-way test tube rack is sturdy and can be used for other size test tubes, even the large safety test tubes (not included). Having the right tools is sure to make your experiment easier and safer! Kit includes 4-way test tube rack, 1 set of tongs, 2 graduated pipettes, 2 test tube brushes, 6 glass test tubes, 6 rubber stoppers and an activity guide. For ages 10 and up.