The Fidget Spinner Toy is quality constructed and made of a smooth durable hard plastic. Its a solid half circle that sits stabilized in the palm of my hand while the inside consists of a small ball with two movable circular pieces surrounding it. The movable pieces glide very easily and spin freely without any interference or friction. This fidget toys supple porous free smooth surface, graceful silent spinning movements and solid build are all ideal to relieving stress. I enjoy it and it truly helps me relax so you can't go wrong with it.