This set of six different sizes of plastic circle embroidery hoops is perfect for whatever i am making. There are six sizes for whatever project that comes up form large to small. They are adjustable and easy to use. Thee are very sturdy and will be an intregal part of my crafting from here on out! This plastic that the hoops are made out of is non-toxic and does not give off any offensive odors. These are definitely reusable or if you wanted you could buy many sets and use these beautiful colored hoops as frames for your projects as gifts!