The Trybike Steel has been designed and developed in the Netherlands by Co and Co after many years of experience with balance bikes. They have applied their experience and selected the best materials, created the most durable construction and added stunning details as well as a quality finish. This Trybike is the first 2 in 1 balance bike made of steel! The bike can be converted from a tricycle into a bicycle with a few simple steps. The perfect all in 1 bike to help your child transition from crawling, to walking, to balancing, to riding.1. Tricycle - The low tricycle offers young children lots of support to start walking and riding. Perfect for ages 15 months - 2.5 years. 2. Bicycle - Easily convert the low tricycle into a low bicycle. At this point the next stage of riding starts, learning how to balance. Perfect for ages 2 - 6 years.