Travelpro Maxlite 3 2 Piece Luggage Set 25 and 21 Spinners Black The polyester exterior is highly durable and resistant to abrasions and dirt The new patented Contour Grip design provides superior mobility for spinners versus other standard luggage handles The handle is made from aircraft grade aluminum and has different height adjustments The spinner wheel system gives you 360 degrees of mobility The unique bottom tray design aligns the wheels for better mobility