uxcell Aquarium Fish Tank Air Curtain Bubble Wall Diffuser Aerator, 30cm Package Content: 1 x Aquarium Air Curtain; Total Size: Tube Length(Not Included Connector ): 30cm/ 11. 8" Color: Black; Material: Rubber, Plastic Product Name: Aquarium Air Curtain; Net Weight: 53g Weight: 10g Tube Diameter: 9mm / 0. 35"