6 ounce Dubro I think?? Go start reading Ricks Tower Up-Roar 40 thread here in building. Lot of pages and lots of Roars. On the last page or two Rick posted up most of the roars and dazzler photos people posted.
I used the roar exclusively during my fun fly days then moved on. Then Rick and Cliff, {daddyoh57} came out for a visit and brought a bunch of roars with them. Rick also brought me a set of plans for the plane and a roll of the Hobby King covering to try out. The covering is great and after all the roar flying I went ahead and built another one. I think it is number 9?? It puts the fun back into flying!!