Features 1.High quality: made of sintered stone+ plastic, and it is odorless, safe and non-toxic 2.The bubble stone can be used to add oxygen volume in the fish tank, keep your fishes safe and secure 3.Fine bubble: the bubble stone can produce the small and fine bubble, and you can adjust the bubble size according to the switch 4.The beautiful color bubble stone can match your fish tank, which makes fish tank beautiful and fashionable 5.Easy to use: easy to install the fish tank diffuser, and convenient to use Specification The fish tank diffuser is made of sintered stone+ plastic, and it is safe and non-toxic. It can be used to add oxygen volume in the fish tank, which can keep your fishes safe and secure. Features: High quality: made of sintered stone+ plastic, and it is odorless, safe and non-toxic. The bubble stone can be used to add oxygen volume in the fish tank, keep your fishes safe and secure. Fine bubble: the bubble stone can produce the small and fine bubble, and you can adjust the bubble size according to the switch. The beautiful color bubble stone can match your fish tank, which makes fish tank beautiful and fashionable. Easy to use: easy to install the fish tank diffuser, and convenient to use. Specifications: Condition: 100% Brand New Material: Sintered Stone+ Plastic Color: Blue Size: 5cm, 10cm(Optional) Weight: approx. 139~506g/4.90~17.84oz Bubble Stone Diameter Overall Diameter Fish Tank Size Suitable Pipe 5cm/ 1.96in 7cm/ 2.75in 50~120cm/ 19.68~ 47.24in 4*6mm/ 0.15* 0.23in 10cm/ 3.93in 13cm/ 5.11in 90~180cm/ 35.43~ 70.86in 4*6mm/ 0.15* 0.23in Package List: 1* Bubble Stone 1* Suction Cup 1* Switch Note: 1. Please allow 0-2cm error due to the manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List