Nurge high-quality Square (rectangular) ABS Plastic Embroidery Hoops are perfect for most styles of needlecraft, embroidery & cross stitch. They make it easy to sew into corners. There is a notch in one hoop that fits into a groove on the other that keeps the fabric firm when sewing. They are available in colors: Coffee Brown, Pastel Blue, Lilac, Pink  & Emerald Green The hoops are also popular for machine embroidery in some machines. They are lightweight and rigid, unlike many cheaper plastic hoops. They are 10mm deep and available in 4 sizes.