Glass Sand Timer 1) Solid wood frame 2) Logo with ... Timing: 2-30 minutes Description of Glass Sand Timer 1. It has two connected vertical glass bulbs allowing a regulated trickle of ... . Factors affecting the time include the amount of sand, the bulb size, the neck width, and the ... . Also good gift for home or office decoration. 5. Color sand: blue, white, yellow, orange, purple…… 6. Individual handcraft, ...