Giant Marimo Moss Balls x2 + 1FREE 1.5"~2" - Live aquarium tank plants low light **No pesticides** SIZEDiameter is 1.5" ~ 2" Inches / 3.8~5cm Very slow growing, dense moss. Be careful if you keep Amano shrimp (Caridina japonica) or algae eating fish like Crossocheilus reticulatus. This moss is considered a specia treat!