Make science fun with hands on activities that encourage experimentation observation and analysis These durable plastic test tubes include leak proof caps so there is no worry about breaking or spilling The five activity cards include simple science experiments that are easily adaptable for multiple grade levels Set includes 5 plastic test tubes 5 screw caps and 5 double sided activity cards Each test tube holds up to 35 mL about 1 oz Features . Test Tube Activity Set Specifications . Weight 3 71 lbs