Features: brand new and high quality Premium Material: Made of high-quality high-transparent glass material, corrosion-resistant, durable, not easy to break. Glass Bubble Counter: Bubbles move along the spiral-shape upward, helps you to estimate amount of CO2 released in your aquarium. Convenient to Use: The spiral-shape bubble recorder is with 2 suction cups, easy to install and operate. Can fix on the aquarium firmly. You can also adjust the position as needed. Delicate Design: Exquisite craft, smooth and bright surface to provide a beautiful appearance for fish for tank.The fine, see-through glass is blended in the environment of aquarium, which can create a sense of harmony and unity. Compatibility: for pressurized CO2 tanks and DIY yeast bottles. Specifications: Material: Glass Color: Transparent Size: Glass Cover Approx.14x2cm/5.51x0.78in Weight: Approx.100g Package Includes: 1 Piece Glass CO2 Diffuser (Includes 2 Pieces Suction Cups) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!