Mountain Bike Mongoose 20 Inch All Terrain Fat Tire Sleek Look Aluminum Steel Frame Front Suspension Smooth Riding Alloy Wheels Rear Derailleur 7 Speed Dual Disc Brake Twist Shifter 3 Piece Crank 100-percent-cotton-jersey Made in USA or Imported Frame: Aluminum/steel Mongoose boys' bike gearing: 7 speeds with Shimano rear derailleur for all types of riding Brakes: dual disc brakes provide all-condition braking Tires: super-sized 20" x 4" tires Rims: alloy 4" wide rims for lightweight durability