Features:1. Made of high quality acrylic material, which is sturdy and durable. 2. It works with 4inch or 7inch filter socks. 3. Easy to install and take off. 4. Fit for 5mm-15mm of the thickness of tank glass. 5. Can be use on acrylic or glass tank. Specification:Condition:100% Brand NewMaterial: AcrylicColor: As Pictures Shown4 inch Size: approx.9.5*13cm/3.7*5.1in(Internal Dia*External Dia),Length: 15.5cm/6.1in, Height: 6cm/2.4in7 inch Size: approx.16.7*21cm/6.6*8.3in(Internal Dia*External Dia),Length: 25cm/9.8in, Height: 6cm/2.4inWeight: Approx.320g~500g/11.3oz~17.6oz Package list: 1 * Acrylic Filter Sock HolderNote:1. Please allow 0~1 inch error due to 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.