The 30 minute modern glass sand timer measures 8"H x 3.15"Dia. This gorgeous sand timer is a hand crafted glass globe and is truly stunning. It is filled with black sand. It comes beautifully packaged in a black and satin-lined gift box. This is a very popular item for corporate events and parties. Sand timers are aesthetically pleasing ornaments, rather than accurate timepieces. This sand timer is usually accurate to within 5 minutes.