Zheng Storm Glass of 17th Century Europe Weather Monitors Weather Forecast The Wood Base Weight : approx. 1270 grams (including packaging) Size : approx. 11 x 20.5mm /4.3 inches*8.1 inches Materials: borosilicate glass, compound liquid, water, ethanol, natural camphor Not intended for use as accurate weather forecasting device Notice: The Case is Similar to Japanese Storm Glass Only.The Storm Glass may need one or two weeks for the crystal to stabilize and adapt to the environment. If you want to see the test result, can be placed in the refrigerator frozen half an hour to an hour, take a look at the change effect.(Due to Effects of physical properties such as solubility and Hot weather,perhaps items become to clear water for a period of time. it is normal for the clear storm glass )