Material: made of transparent glass, strong and durable, very transparent and easy to clean, a great aquarium accessory. Permeable holes: The hole at the bottom of the cup promotes water circulation and absorbs more oxygen, which is beneficial for the production of aquatic plants. Technical data: The diameter is about 6 cm and the height about 7 cm. The tilted design has a positive effect on light absorption and promotes photosynthesis. Stable suction cup: The double suction cup construction allows the aquarium glass flower pot to be firmly hung on the aquarium. You don't have to worry about it falling off the aquarium wall. Practical decoration: can be used for growing small aquatic plants to increase oxygen levels or as a plant pot food.