MEDICALLITE Supinator And Pronator (Rainbow Type),, Supinator And Pronator (Rainbow Type) Supinator & Pronator, an Ideal treatment modality for limited upper extremity range of motion. * Chrome plated arc is fitted on a laminated wooden base. * Patient moves 6 brightly colored laminated wooden rings from side to side, improving ROM, developing eye-hand coordination, strengthening, crossing-mid-line