Surepromise 6 pcs in set Round Natural Bamboo Wooden Sewing Embroidery Cross Stitch Ring Hoop 4''/5''/7''/ 8''/10''/12''(10cm, 13 cm, 17cm, 20cm, 26cm, 30cm) Material: Natural Bamboo It is with a metal screw to hold your work. 6size 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.