Sand Timer Set: Package includes 6 pieces Rubik sand timers. 1 minute, 3 minutes, 5 minutes, 10 minutes, 15 minutes, 30 minutes timer in one set. These different time length hourglasses can meet various uses in daily life. Durable and Safety: Made of durable PVC, high borosilicate glass and protective cover. which allow hourglass timer not easy to be broken, very durable to use. Time Management Tool: Rubik Sand timers can help your kids develop a strong sense of time. Good idea to help your kids doing things more efficiently. Widely Used: Ideal for Games, Classroom use, Cooking, Exercising, kids’ tooth brushing and so on. Also can be used as a decoration. Great Gift for Children and friends. Note: This sand timer is not a precision timing device, so there is time deviation. What's more, please don't use anything to scratch the words on the glass to prevent the words drop off.