The Blackburn Kids Bike Bicycle Black Tire in 16" x 2.125 is designed specifically for kids' bikes, featuring a knobby tread type for optimal grip and performance. Made of durable rubber material, this tubeless tire is lightweight at 1.3 pounds and comes in a sleek black color. With a tread depth of 3.0 inches and a size of 16" x 2.125", this Blackburn S41 model is the perfect choice for young cyclists looking for a reliable and high-quality tire for their bike.