Marshall Pet Products Pop-N-Play Ferret Ball Pit Toy The Pop-N-Play Ball Pit is a fun and interactive toy for one or many ferrets Attach a Marshall Super Thru-Way to the Pop-N-Play Ball Pit for even more ferret fun The Pop-N-Play Ball Pit includes 35 plastic balls and is folds flat for easy storage. Pop-N-Play Ball Extra Ball Packs are sold seperately for even more digging fun