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 70” For your best watching experience, we fit 4 360° rolling castors, of which 2 castors have brakes to achieve flexible stop. Sturdy base with 2 locking casters easily move or fix the TV cart as needed. Plus, the height can be adjusted from 110cm/43.3” to 160cm/63" 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