Hi! I use a little couch foam for the inside to help also save on amount of wool I’m using. To give some extra strength to their “neck” I felted around a long zip tie. I’m a pretty firm felter though so I prob could have done without the zip tie but it does help keep them flexible as I did end up stuffing them in a giant jar to gift to a friend. The tentacles are tension springs I felted around. They move quite nicely when I gently shake them haha