Multiple sizes: each set has 6 different sizes of embroidery hoops and a bag of 16 pieces. The diameter sizes are 3.6 in, 4.8 in, 6.3 in, 7.9 in, 9.5 in, and 10.7 in. High-quality plastic material: durable, lightweight, non-fading, with smooth surface that won't snag fabric. The opening is wider with upgraded adjustable screw to easily tighten fabric and keep it firmly fixed. Suitable for embroidery, cross-stitch, sewing, and various embroidery projects, providing good tension. Great for beginners and Diy enthusiasts.