Wahlsten Sponge bit is made of foam that appears new thick, but is embedded through use. For horses with wounds, an injury or very sensitive are in the mouth. Put the sponge bit in salt water and it will promote healing. A horse that has wounds in his mouth, an injury or is very sensitive in the mouth can be ridden with a Sponge bit. Wahlsten Sponge bit is a very soft foam bit that looks new and thick, but is embedded through use and has a nylon cord at the core. If the horse has wounds in the mouth such as open mouthcorners, put the sponge bit in salt water and it promotes healing. Leather, rubber and foam bits are not guaranteed against bites even after the first use