Beehive Sliding Mouse Guards Entrance is made of galvanized iron, and it is safe and non-toxic. Use these in the autumn when mice or other rodents may be looking for a warm winter retreat, prevent the nasty little critters from eating honey, pollen, and even the bees, destroying comb and generally disturbing the nest. The arches are ample in size to allow bees to freely in and out. Reusable and durable: can be used repeatedly and durable for long use. Designed with a new style, easily removed or reversed to use as a travel gate.