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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.). Recommended age 5+ years