Material: Natural BambooIt is with a metal screw to hold your work.6 size in set.Size: 12"(30cm)，10"(26CM)，8"(20CM)，7"(17CM)，5"(13 cm)，4"(10cm)Due to the manmade，all measurements are approximate and may vary by size. Thank you for your understanding.Package includesCross Stitch Ring Hoop x 6