Jamun wood tumbler (glass) is made out of Jamun tree. It is the natural product and is useful for diabetic. The water stored in the tumbler for one hour in the morning & one hour in the evening is considered healthier for drinking. This glass can be used for 30 days for best results. Vijaysar wooden glass that has of Jamun tree (Indian Kino Tree). It is the natural product and is helpful for diabetic. The water stored in the Tumbler for one hour in the morning & one hour in the evening is considered healthier for drinking. The color of the water changes to brown and glass is changed after around 30 day when the water color does not change.