I found you never give a cat an empty spool for a toy. I put a lot of empties in a cat cube with many other cat toys but found my little female was getting on the shelf under my machine and pulling the spools and empty bobbins off the spool holder inside the door off. Ever put your shoes or boots on and find a bobbin inside??? LOL she also puts her paws inside a plastic barrel of sewing stuff and gets the spools of thread out of there too. Maybe sewing stuff is a "girl" thing!