1.expanding barrier 2. Customized sizes and colors are acceptable 3. Folding and Expanding 4.Could be Assembled 5 Wheels possible in the bottom,it can be put on or take off 6.Bolt on the flank, could be connect with others more 7. with big wheels in the middle , and wheels with brakes in sides . 8 .UV-resistant powder coating; 9. Spraying plastic.