Bits for horses are provided which include a central element, suitable for being inserted in a horse's mouth, a pair of lateral rings, each connected to a respective end of the central element for connection to the reins, and a pair of rosettes for protecting the horse's lip, each traversed by an axial hole to be fitted around the central element, next to the connection to the ring. The axial hole is made in an emerging portion axially facing at least the side opposite the lateral ring. The wall which delimits said axial hole may be sized to provide a stable connection due to the friction between the rosette and the central element.