Description: Made of high quality wood material, friendly and for your . Helps your hamster exercise more and develop agility. Widened and thickened wood base provides reliable and stable mount for the exercise wheel. It not only serves as exercise toy preferred for small pet sports activities but also a nice decoration. The wooden wheel is noiseless, when with this wheel, it will not disturb you. Specification: Material: Wood Size Chart: M: Outer diameter 21cm/8.27inch, inner diameter 19.2cm/7., base width 12cm/4.72inch, overall height 23.5cm/9.25inch, wheel outer width 8cm/3.15inch, inner width 7.2cm/2.83inch; L: Outer diameter 29cm/11.42inch, inner diameter 28cm/11inch, base width 14cm/5.5inch, overall height 32cm/12., wheel outer width 9.5cm/3.74inch, inner width 8.6cm/3.39inch; Package Includes: 2 Pieces Small Pets Exercise Wheel Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.