Develops neck, shoulder, and arm muscles while providing fun for the user. Ball casters are concealed in protective “fenders”. Child is kept in an extension position by abductor wedge and side fenders. Protective hip strap is provided for added security. Complete with 3 positioning shapes and abductor wedge. Child size 28'' (71cm). For up to 40'' (102cm) tall and 125 lbs. (57kg). Also available in Adolescent model - W4305.