This TV stand is constructed of powder-coated metal and durable plastic. The flexible and adjustable mounting system fits most TV sizes from 32'' to 65''. For your better watching experience, we fit four 360° rolling castors, of which 2 castors have brakes to achieve flexible stop. The sturdy base with 2 locking casters easily move or fix the TV cart as needed. Plus, the height can be adjusted from 110cm to 160cm to meet your various needs. The extra shelf is for holding a DVD player, cable box, X box, etc. Good quality and thoughtful service will make your life comfortable!