Engineered Now The Original Headrest for The Herman Miller Aeron Chair (H3 for Classic, Zinc). Size: H3 for Classic. Back Style: Solid Back. Special Feature: Ergonomic, Head Support. Size:? H3 for Classic. Back Style:? Solid Back. Frame Material:? Engineered Plastic. Special Feature:? Ergonomic, Head Support. Unit Count:? 1 Count. Recommended Uses For Product:? Office. Maximum Weight Recommendation:? 300 Pounds. Age Range (Description):? Adult. Included Components:? Headrest, Hex tool, Replacement Bolt for A-Size Chairs, Spare Caps, Instructions. Surface Recommendation:? Hard Floor. Item Weight:? 3.3 pounds. Item model number:? Headrest by Engineered Now. Date First Available: March 7, 2017. And we will work with you to resolve it to your satisfaction.