Propagation Stations come with 25mmx150mm glass tubes (one or two, depending on style selection). These are great for beginner plant enthusiasts or the experts. Display these with the glass tubes, and add a leaf cutting for good show! Our Stands are 3D printed with PLA - a type of thermoplastic polymer derived from Upcycled materials like Corn, Beets, and Wheat Grass. PLA is 100% biodegradable, recyclable and compostable! These planters are DURABLE.