This is an insole from 3COINS that can hide an AirTag. Ideal for preventing children from getting lost or abducted, and for monitoring children who will be commuting to school starting in April. Size: 17.5cm - 19cm To address thickness issues, the item may be opened before shipping, and one insole may be placed upside down. Please understand. Keywords: School Commute Train Commute Private Elementary School Entrance Preparation Child Monitoring Crime Prevention AirTag AirTag Holder AirTag Case Children Elementary School Students Shoes Insoles Thank you for viewing.