Skillbuilders Half Roll 4 x 18 w 2 Elevation Staircases Diagnostic sets are among the Style:Right Ear Diagnostic sets are among the most critical toolsets in a clinician's repertoire to perform a comprehensive physical exam * Welch Allyn diagnostic sets help physicians perform fast exams and accurately diagnose a range of patient conditions thanks to innovative optical technologies that help clinicians get wider views of the optic disc and tympanic membrane * With continued advances in instrument technology long lasting power sources and new advances in lighting technology that include LED options your diagnostic tools can not only help you perform a a thorough and comprehensive exam but also can help you operate quickly and efficiently * Features: * Choose PanOptic Lift: Internal power source * Degree of shock protection: Charger * Skillbuilders© premium rolls and wedges have an integral waterproof polyurethane coating that is easily maintained * Half rolls combine stability of a wedge with the positioning versatility of a roll * Use with hook on bottom to anchor roll * Provides stable base for knee flexion and extension