The AL-KO GW50 garden roller has a steel body & the ability to be filled with either water or sand making rolling of your lawn easy, or for simply pressing seeds down into the soil preventing them from being blown away or eaten by birds. Cleaning the scraper bar helps keep the roller clean from mud & any other debris attached The GW50 is water tight preventing leaks when filled with water or sand Robust steel body & frame that can be filled with water or sand