These exquisite handblown glass spheres are in 15cm (6 inches) in diameter. This version has a flat bottom and a 15mm hole on the top with a removable silicone stopper. The stopper also has a small hole for air exchange. Handblown Glass Sphere with silicone stopper - stopper has small hole for air exchange Use these glass spheres to create a beautiful terrarium for your favorite succulent or air plant Fill it with sand, shells or seawater for a beachy vibe These spheres can be filled with water, plants or sand to create a captivating display