Propagation Stations come with 25mmx150mm glass tubes. These are great for beginner plant enthusiasts or the experts. Display these with the glass tubes, and add a leaf cutting for good show! Trending way for black and green thumbs to have a plant! 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.