Feature 1MORE STABLE: Rolling pen is about 24cm long, which is long enough for you to use. And both ends of the pen are embedded with metal for counterweight. 2BRAIN TRAINING: Suitable for both children and adults. You can use this pen to train your hands, eyes and cerebellum, so you can improve your concentration, memory and learning ability. 3LED FLESH LIGHT: The surface has a frosted, non slip design for a comfortable grip. Equipped with LED flesh light, it can be more cool light at night. 4PERFECT GIFT: You can give this gaming finger pens as a gift to your friends, relatives, colleagues, classmates on Thanksgiving, Christmas, New Year, birthday, etc. 5RELIABLE MATERIAL: Rotating pen is symmetric design, the pen made of durable plastic, metal and silicone, which is reliable and sturdy and can be applied for a long time.SpecificationItem Type: Rolling Finger PenMaterial: Plastic, metal, siliconeSize: Approx. 24 x 1.5cm / 9.4 x 0.6inBattery: 1.5V 43mAh 6 x LR41 button cell (built in) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Rolling Finger PenNoteThe pen cannot be used for writing.