These are Mini X-zylo Gyroscopes from the William Mark Corporation.Suitable for ages 8 and older.Features: Capable of flying up to an incredible 46m! Throw by hand or launch with the X-Laucher (WMCH4002).Weighs less than an ounce yet obtains superb flight characteristics similar to that of a bi-winged plane! Flight instructions included.Includes: (2) Mini X-zylos Specifications: Mini X-zylo Diameter: 7.6cm Cylinder Length: 1-7/8.