Material: Plastic ,Metal,Hybrid Ceramic Bearing
Size:6*3*1.6cm/2.4*1.2*0.6inch
Prefect size for adults and kids , easy carrying everywhere
Small,Simple,Discrete and Fun,also effective for Focus and Deep Thought
It can help them quit smoking, ADHD, obsessive-compulsive disorder, anxiety, post-traumatic stress disorder, meditation and boredom, can bring users a sedative effect.