Darice Spring Tension Hoop... Size: 3.5" (8.90cm) The Darice Spring Tension Hoop is an amazing & renowned cross stitch & Needlepoint aid for small & large projects. The hoop allows you to move and control your stitching area. The tension hoop is composed of two parts - a plastic ring and a metal ring with a spring adjustment on it. The metal ring fits into the grove in the plastic ring when the spring tension clamp is squeezed together.