This is an ideal ball from Trixie to pop some treats or pellets in and let your bunny roll it around to release them.
Safety note: It is the responsibility of the pet owner to assess the suitability of any treat, toy, or other product. Please read instructions, and directions of use carefully. Always supervise your rabbit whilst playing or eating. Remove the toy if it is damaged, or worn, or if parts become separated, to avoid injury.