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Plastic giant sand timer, 30 minutes plastic classroom sand timer.
Eco-friendly ABS lids, clear acrylic tube, glass bulb and colorful glass beads as the sand.
The sand timer has 2 sizes:
Small one: Dia8.4x16cm, time from 30 seconds to 30 minutes
The big one: Dis15.4x30cm, time from 30 seconds to 45 minutes.