Abstract: An artificial shuttlecock includes a ball head, a plurality of feathers, and a plurality of stems. Each of the feathers includes a notch. The notch is disposed on an outer edge of the feather. A ball head end of the stem is connected to the ball head, and a feather end is connected to the feather. The stem includes a body, which tapers from the end close to the ball end to the feather end. The end of the body close to the ball end has a first width, and the body has a second width at the feather. The first width is between 2.1 mm and 2.4 mm, and the second width is between 0.4 mm and 0.6 mm.

Abstract: A self-adhesive stacked set including a plurality of stacked bodies is provided. The plurality of stacked bodies form a three-dimensional geometry, and a top view shape of the plurality of stacked bodies includes a triangle and a quadrangle. Each of the stacked bodies includes a plurality of stacked layers, and the plurality of stacked layers are stacked on each other. A rear surface of each of the stacked layers has an adhesive region, and the plurality of stacked layers are stuck to each other via the adhesive region.