Key Features Green Adds interest to your tank Weighted base to keep stable. Made from fish safe plastic Easy to move and position Oase biOrb Topiary Balls are a selection of coloured and decorative Topiary balls that can be added to your biOrb tank to accent your existing set up. Each ball has a weighted base to stop the decorative plant from falling over and makes it easier to move and reposition them if needed. 4 Colours and designs to choose from, each ball has been inspired by a selection of moss species seen around the world. Each ball adds colour and interest to the base of your tank Specifications Each Ball: 11cm x 8cm (WxH) *Measurements are approximate