Features: Relieve your stress: 2 Iron rings joined together to provide smooth and fluid motion. Keeping your hands busy, increasing finger movement, promoting hand blood circulation, refuse fidgeting and slow down anxiety, bringing people a calm mood. Suitable for the people who suffer from ADD, ADHD, Anxiety, Autism, etc. Widely application: Those fidget toys are suitable for teens and adults, ideal for hours and hours of non-distracting and silent fidgeting, small body is easy to carry, can be taken to the classroom, the office, the plane, etc. Specifications: Material: stainless steel and silicone rubber Size: about 48 x 30 mm/ 1.89 x 1.18 inches Color: blue, yellow, red, green, and purple Package includes: 100 x Bike chain fidget toys Notes: Please allow slight deviation in size due to manual measurement. Please allow slight color differences due to different monitors and light effects. Suitable for people over 12 years old.