The sauna hourglass "Special" is made of solid beech wood, suitable for the sauna room. It runs for 15 minutes, for the sand there are 4 different colours to choose from. Note: Sand is a natural product. Each grain of sand is shaped differently. Therefore, it is difficult to specify an exact running time for hourglasses. Tolerances of up to 2 minutes are unfortunately not to be avoided. It may happen that several sand grains block each other at the passage point. Simply tap lightly against the glass or briefly turn the hourglass to eliminate the blockage. Under certain climatic conditions, a light film can form on the inside of the glass cylinder. This is not a production defect but a natural appearance due to static loading. For all hourglasses, the glass is glued with a heat-resistant special adhesive. This significantly reduces the risk of breakage.