The Prevelo Alpha Zero is a 12-inch kids' balance bike and the starting point of the Alpha range, engineered to give the smallest riders a confident start. At just 6.9 pounds it's light enough for a toddler to truly control, with a low step-through aluminum frame, child-specific geometry, and a real rear hand brake that teaches proper stopping from day one (no coaster). Tool-free seat adjustment grows with your rider. Built for ages 1½ and up. Fits inseams 12.5 to 16.5 inches.