Description
Hourglass is very effective visual cue that help to improve attention and management..Notice: This sand timer is not precision-timing device, so there is time-deviation..The bright colored sand floats down, and is used for furnishing home decorations and gifts..4 different color and hourglass sand timer for choose, with borosilicate glass, and waterproof..Suitable for regular cooking, game, children brushing teeth, sports, schools,