his Planter holder molds was composed of 4 test tube(0.7" Inner diameter) and 1 rectangle epoxy resin molds with 4.8" sides and 1.5" thickness, Removable test tube planters are suitable for most types of small plants, using this silicone vase mold to make an elegant plant station, perfect for a windowsill or desktop.
https://letsresin.com/products/vase-mold