Advantages for you: Made of GRP, these come with a 10-year warranty. - Container and lid from glass fibre reinforced plastic, GRP - GRP grit containers are 100 % corrosion- and weather-proof - Stainless steel spring closure, self-closing - Simple opening from outside and inside - Simple, safe handling - Space and time-saving to store and remove from storage (stackable) - 10 year guarantee - With anti-vandalism lid