Material: Made of clear glass, strong and durable, highly transparent and easy to clean, a great aquarium accessory. Permeable holes: The hole at the bottom of the cup promotes water circulation and absorbs water more oxygen, which is beneficial for the production of aquatic plants. Specifications: The diameter is about 6cm and the height is about 7cm. The inclined design has a positive effect on light absorption and promotes photosynthesis. STRONG SUCTION CUP - Double suction cup design, the glass aquarium flower pot can be hung on the wall firmly. You don’t have to worry about it falling off the aquarium wall. Practical decoration: Can be used to grow small aquatic plants to increase oxygen levels, or as a plant pot fertilizer.