They feel soft and smooth and surprisingly firm. They will hold on tightly using their suckers. Some will pull hard others are gentle. The suckers are sensory receptors, they taste with them. Diablo was the most aggressive octopus I've owned, at times it was difficult to get him off my hand if he didn't want to let go. Usually, a touch on the back of the arm will cause them to release, not him. He did try on several occasions to explore outside the tank. It is amazing when you gain their trust and they allow you to pet them. You always need to be aware of the beak. I'd never give one the opportunity to pull my hand too close.