The "LowKit" Lowering kit should be used with FirstBike when a child's feet cannot be firmly placed on the ground, knees slightly bent, when the seat is in the lowest position. When properly installed, the "LowKit" allows a younger child, from approximately the age of 22 months until the child is ready to ride FirstBike without the LowKit with the seat in the lowest position or a minimum height of 87cm/34.3 inches, to ride FirstBike. The "LowKit" Reduces the seat height by approximately 4cm/1.6 inches (allowing a "LowKit" adjustment range of the seat height from 29.5cm/11.6 inches to 39.5 cm/15.6 inches). What's in the box 1 x Lowering Kit