Passwell Rat and Mouse Delight Bar 75g. Rat & Mouse Delight is a healthy treat bar designed to promote chewing action, foraging behaviour and dietary variety in captive rats & mice. Key Features: Tasty mix of grains, legumes, fruits, nuts & high-fibre chaff. Fortified with rat & mouse pellets & vitamins. Convenient twin pack to limit feeding portions. Edible gelatine binder (not glue).