Features: brand new and high quality Portable Toys: Portable size can be held in hands, roll it between your fingertip, which is suitable for offices, churches, libraries, stations, special education classes, physiotherapy or educational purpose. Applicable for Various Person: Applicable for various people such as inattention, and autism which can well improve and assist daily relieve stress and irritability, and improve concentration. High-quality Materials: Made of food-grade high-quality metal, non-toxic and eco-friendly materials,no fade which are safe for kids & adults playing. Stress Relief Kits: Assist to relieve stress by playing, twisting over the fingertip or desktop which also helpful for kids,toddlers brain stimulation toy & good educational toy sets. Best Choice for Kids & Adults: Suitable for kids or adults as birthday gifts, Christmas gifts, and best choice stress relief toys, meet the requirements from kinds of person. Specifications: Material: Metal Color Option: Model A/Model B/Model C/Model D Net Weight: 85g/0.18 lbs Product Dimension: 6 x 3.6 for cm/2.36 x 1.42 inch Package Includes: 1 x Stress Relief Bike Chain Toy note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.