Abstract: The present invention relates to a teeth washer structure, which includes: a guiding tube and an ejecting tube; the guiding tube includes a connection part, a tube body, an engage part and a first flow channel formed therein, a surface of the connection part is formed with a thread, and the portion of the first flow channel defined in the engage part is formed with a gradually-shrinking structure. One end of the ejecting tube is formed with a water inlet part connected to and communicated with the connection part in a watertight manner, another end thereof is disposed with an ejecting nozzle, the end of the ejecting tube where the ejecting nozzle is disposed is formed with a bendable structure, the interior of the ejecting tube is formed with a second flow channel mutually communicated with the first flow channel.

Abstract: A low-density alloy for a golf club head includes 84 wt %-94 wt % of Ti, 6.5 wt %-9.5 wt % of Al, and/or V less than 1.5 wt %, providing a Ti—Al—V-based alloy having a density smaller than 4.40 g/cm3. Trace elements such as Mo, Cr, Fe, Si, and B may be added into the Ti—Al—V-based alloy to provide a titanium alloy having a low density and high elongation.

Abstract: A reelable keyboard, which includes a soft keyboard, a first shell body, and a second shell body. The soft keyboard is connected between the first shell body and the second shell body. The first shell body has a winding mechanism therein used to wind up the soft keyboard. A positioning button disposed on the first shell body is used to control whether the soft keyboard is pulled out from or is wound into the first shell body. When the keyboard is to be used, it is only necessary to pull out the soft keyboard from the first shell body. When not in use, the soft keyboard is wound in the first shell body. Thereby, the volume of the keyboard can be effectively shrunk to facilitate portability.