Watch your plant babies grow in this concrete propagation station. Each item comes with a glass tube. These make great gifts and decorative items for small shelves. ✦ Each item includes 3x clear glass, round-bottom Test Tube Vases. ✦ Flat-bottomed Glass test tubes that measures 25 x 120mm ( 1in x 4.8in ) ✦ Total volume of test tubes: 55ml ✦ Material: Glass test tubes are made of borosilicate glass, heat resistant. ✦ Cement in a Multiple colors ✦ Handmade in Seattle, WA. ✦ Sealed with mix of carnauba wax, Beeswax and food grade mineral oil ✦ Finish: smooth satin finish