A handmade hourglass made of handmade wood, compacted glass and natural sand. Has high heat resistance. Therefore, it not only guarantees the safety of the sauna, but also uses it for a long time. It is also an gift for garden sauna or infrared cabin lovers. Features - Material: Wood, glass. - Size: About 9.00X5.00X3.00cm/3.54X1.97X1.18inch. - Our sauna sand clock has significantly reduced the error limit to below 10%. - The sauna watch ensures a healthier sauna. With a sauna of suitable time, you can effectively strengthen the immune system and the cardiovascular system. - With contrasting colors, you can still see a clear picture a few meters away. - Can be used as children's toys, family decoration, board playing cards timing, sauna timing. - It can be installed by punching it on the back and rotating it 360 degrees. If necessary, you can also add adhesive.