The Grass Rings were created to allow you to personalise your biOrb aquarium. It is made from materials that are totally safe for aquatic life. Designed as a single ornament to cover the centre bubble tube and pre-fitted with green synthetic plants. Three sizes are available, a small version for the baby biOrb, a medium for the biOrb 30L (8 US Gallons) and a large version for the biUbe 35L (9 US Gallons) and biOrb 60L (16 US Gallons). The Grass Rings are easily removed for aquarium cleaning and eliminates the need to reposition the plants afterwards.