Features: When your betta fish sees his reflection, he exercises "his fins". Reduce the boredom of captivity. Watch your betta perform natural behavior. No assembly is needed and is designed to be used daily Suitable for both freshwater and saltwater habitats. Specifications: Material: Acrylic Size: 5/6/7 5-Approx. 5cm/1.97in 6-Approx. 6cm/2.36in 7-Approx. 7cm/2.76in Package Includes: 1x Betta Exercise Mirror note: Material: Acrylic Size: 5/6/7 5-Approx. 5cm/1.97in 6-Approx. 6cm/2.36in 7-Approx. 7cm/2.76in