metal tentacles

You found a really interesting product online called "Metal Tentacles," and you were intrigued and decided to buy them. A week later, the package arrived. You brought it home and opened it, but instead of just one tentacle, there were 10 of them, along with a glove for manual control and a remote control that lets you choose a behavior pattern. The tentacles looked like metal discs, and when turned on, they opened up and looked like regular tentacles, only made of metal. The instructions said their maximum length was 140 centimeters, and they could also be attached to walls or other surfaces.