Material - Brass, Sand & Glass Color - as shown Size - 5 inch Duration 3 min. approx. Handmade sand timer Green sand with compass one side and other side watch dimension 4 cm watch and compass diameter good battery operated watch and To replace the watch battery, the screw system is provided above in the watch, there is no need to remove the sand tube. Must to have for maritime collector fully functional sand timer, watch and compass.