2 Pcs Aquarium Nano Aeration Air Stone Bar Micro Bubble Diffuser for Fish Tank Aquarium Aeration Natural Safe Fish and high quality Features: Micro bubbles dissolve more oxygen into water and burst peacefully on the water surface. The abundant cascades of tiny bubbles are perfect for fish, betta, shrimp, and all kinds of aquatic creatures. Durable frosted material with small vent holes produces fine air bubbles and better atomization effect. Low-pressure operation is energy-saving, includes a large suction cup to secure the air pipe and prevent sliding. Specification: Type: Nano Oxygen Stone Material: White corundum + Alumina Applications: Fish Tank Aquarium Aeration Dimension: approximately 10cm / 3.94in Color: White and black Quantity: 1 Set (2 Pieces) Note: 1. Please allow 0-1cm error due to manual measurement. Ensure you are comfortable with this before purchasing. 2. Due to differences in monitor displays, the actual color may vary slightly from the image. Package includes: 2 Pieces x Nano Oxygen Stone