Common racket frame materials on the market are: carbon fiber, fiberglass, aluminum alloy, magnesium aluminum alloy, iron, steel, bamboo and wood. The second is the visual method, see if there is a black layer near the part of the racket face, whether there is a micro-sawtooth, aramid fiber fabric is relatively thin, and the warp and weft of the weave, after sawing naturally have a micro-sawtooth.

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Echo, the initial form of the future smart home, is the control center of the smart home, which can control third-party smart home devices such as air conditioners, lights, doors, curtains and so on through voice interaction, and can support making phone calls and sending messages, querying recipes, playing music and so on, which is powerful and completely liberates your hands.