This item fits the Caesar 12 ft x 10 ft aluminum gazebo perfectly.  We were impressed on how heavy the material was, very good quality.  It took 3 guys and 2 ladders, but it went on very easily.  Tip - the cover is folded inside out, so you have to turn it right side out before sliding it on.  Only complaint is there is only one Velcro strapping in each corner at the bottom.  We purchased flat bungee cords to go around the centre (not shown in picture) to secure it better from the winter winds.  You will definitely need to weigh it down, we used pressure treated 4x4 deck posts, hopefully that will do the job.