Hypnotic MAGNOIDZ Magnetic Sand Timer for Mesmerizing Playtime FunTurn the glass timer over and place back on to the base. The base is magnetised which means that when the iron filings fall through and land on the base they begin to build up on top of each other and form amazing and unique sculptures.Item Dimensions 8.30 x 17.00 x 8.30 cm.Suggested age suitability 3 years and upwards.