Replacement Seat for Herman Miller Classic Aeron Size B Medium (Black Mesh). Product Dimensions: 18″D x 20.25″W x 6H. Size: SIZE B MEDIUM. Back Style: Solid Back. Product Care Instructions: Wipe Clean. Unit Count: 1.0 Count. Recommended Uses For Product: Office. Maximum Weight Recommendation: 300 Pounds. Age Range (Description): Adult. Included Components: User Manual. Model Name: Aeron Size B. Surface Recommendation: Hard Floor. Furniture base movement: Swivel. Seat Depth: 18 inches. Reclining Position Count: 1. Item Weight: 4.76 pounds. Country of Origin: China. Item model number: Aeron Size B. Date First Available: September 30, 2020. Fits Your Herman Miller Chair – Measuring 20.25 inch Width x 18 inch Depth x 6 inch Height, our Herman Miller Aeron replacement parts are designed to fit any Classic Aeron chair size B. Replace your old chair seat with great ease! Tough & Durable – Our Aeron Seat Replacement parts feature a reinforced, heavy-duty frame to ensure that it won&#######x27;t break, crack, or get damaged easily. Sit on your new cushion without worries! Sit Comfortably – This seat is made of filament which offers fantastic ventilation, so you can stay cool all day. Our seat&#######x27;s black mesh fabric also matches the mesh of Herman Miller Aeron chairs. Fuss-Free Installation – No need to call a handyman to put these chair seat replacements in place. This new Aeron chair seat comes with a manual that&#######x27;ll help you remove and replace your old seat. Ready To Use – With this new Replacement Seat, there&#######x27;s no need to assemble mesh, and foam required. The seat itself comes ready to install so you&#######x27;ll only need a few minutes to revamp your Herman Miller Classic Aeron desk chair.