Size: 7.5 *7.5cm Material: Plastic-Metal Color: Black, White, Blue, Red, Yellow, Green (Please message us your color or we will send you a random color!) Suitable for: Adults and Kids Product Feature: Easy to carry, Small, Simple, Discrete and Fun, also effective for Focus and Deep Thought. Use This Way: Hold spinner in one hand and use the other hand to spin it rapidly using small continuous strikes to keep it spinning indefinitely with practice, spinners can be spun using one hand using the fingers of one hand to stop and start spinning.