The Aerobie Superdisc is the world's easiest disc to throw and catch. The Aerobie Superdisc's unique two-piece construction features a comfortable gripping surface for accurate throws and a soft outer rim for confident catches.The Aerobie Superdisc's breakthrough wobble-proof design helps stabilize flights. Throws that used to roll over or veer off course will now fly their originally intended path. Throw only in a clear space to an alert catcher, and never throw a modified or damaged aerobie flyer. Dogs love to play with it too! Measures approximately 10 inches in diameter. Popular Science Magazine Award Winner