Material:Glass+PlasticColor:5 Colors to ChooseSize:16x8.2 cm/6.3x3.2 inchIdeal for teaching time management， ADHD， Autism， SEN， Visual Clue for Homework， Playing Games， Concentration Behaviour Management， Time Out and more...Our Full Range of timers includes:2 Minute - Orange Orange sand3 Minute - Yellow Yellow sand5 Minute - Blue Blue sand10 Minute - Green Green sand15 Minute - Purple Purple sandKindly Note: this product is not a toy， adult supervision required， item contains glass.The sand timers are accurate with on occasion a small margin of error， typically a few seconds over or under.http://contestimg.wish.com/api/image/rating?name=7d7d7a927ae011e6a922065f903a9ac5.jpg&w=1000&h=1000&m=0&t=0