Petmate Double Treat Ball, Purple This Fabulous Cat Toy Packs In 2 Of A Cat'S Favorite Things: Catnip & Treats! The Booda Double Treat Ball Is A 2-Sided Treat Ball For Twice The Fun Easy To Fill, This Unique Toy Has A Catnip Compartment That Attracts Cats To Play While The Toy'S Rolling Action Dispenses Treats, To Entertain & Stimulate A Cat'S Natural Curiosity Made of extra firm, lightweight rubber, the Double Treat Ball is easy to bat & chase & it's easy to use To Fill, Simply Unscrew The 2 Halves, Remove The Red Cover On The Catnip Reservoir, Fill The Compartment, & Reseal Then, Fill The Space Around The Catnip Holder With Cat Treats Or Kibble & Screw The 2 Halves Back Together