1)magnetic roof top car sign 2)different color can be chosen ... cheap price 4)material:PS Feature: 1) magnetic roof top car sign 2)color:red,green,yellow,bule,grey3) ... bottom has strong magnets, can be fixed in the car top, and anti-scrape flower design to keep, maintenance vehicles ... visability control caps. Three shielded magnets firmly secure the hat to the roof, hood or any metal surface. Triangular ...