Our starter science flasks are made from clear and durable plastic, feature rainbow stoppers that fit snugly and are built to withstand years and years of experimenting. Details: Assorted colors 9.56" x 3.74" x 5.5" packaging size 15 pieces Includes 4 kid-friendly experiments Sized for little hands Plastic Suitable for ages 3 and up Contents: 6 flat-bottomed test tubes 6 assorted stoppers 1 reusable cleaning brush 1 test tube rack 1 activity guide