Feature: 1. Stable Operation: High dissolved oxygen ultra quiet, high dissolved oxygen content, avoiding splashing, minimal vibration to water, operating below 20 decibels. 2. Simple Adjustment: Equipped with a gas regulating valve for better control of air volume, the gas volume can be adjusted according to needs. 3. Firm in Fixing: The thick L shaped intake pipe adopts a double suction cup fixed design, which is not easy to fall off and is sturdy and durable. 4. Good Material: High temperature sintered white corundum sand is more durable, breathable, and not damaged after long term use. 5. For Your Aquarium: Small size, high transparency, small and exquisite, does not occupy fish tank space, transparent and transparent, can integrate with plants. Specification: Item Type: Aquarium Air Stone Disc Material: Crystal Glass, White Corundum Sand Application: For fish tank.. Package List: 1 x Aquarium Air Stone Disc 2 x Suction Cup1 x Adjusting Valve