Sensory Fidget for Kids: These sensory rings are specifically designed for children to develop their and improve their attention and focus Material: Made from soft silicone material, these children silicone rings sturdy for long term use Design: The rings design allows these silicone sensory rings providing fun for your kidsEducational: With a soft texture and bright colors, these quiet fidget toys not only attract children's attention but also serve as educational toolsWidely Used: Kids relaxing toy is Lightweight and prtable, sensory toys for classroom, stocking stuffers gifts,prize Specification: Material:Silicone Size Chart: Small:Inner diameter:1.47cm/0.58inchLarge:Inner diameter:1.7cm/0.67inch Package Includes: 12 Silicone Fidget Rings(6 Small and 6 Large) Note: 1.This is not infant toy , please take away from children to avoid eating.2.Please allow slightly errors 1-2cm differences due to manual measurement.