1. The net is 7m long and 1 m wide, and is located above the vertical plane of the centerline. The net is dark; The grid is 10 square centimeter. Sew a layer of double-layer white canvas with a width of 5cm on the upper edge of the net, pass it through with a soft steel wire, tie the upper edge of the net tightly, and tie it under the net with a rope. Fixed on the net post.

2. Marker poles: Two tough poles made of solid materials, with a length of 1.8m and a diameter of 1cm, are painted with red and white every 10cm, and placed on both sides (outer edges) of the center line respectively, which is 80cm higher than the net. The marker pole is considered as a part of the net and serves as a sign of the boundary between the two ends of the net.