... The material of the back is 0.17mm galvanized steel sheet. 4. Aluminium frame with plastic ABS round corners. ... strong carton. 8.Can make into double cork sides, or one side cork board one side white board. Different ... boards), children's boards, flip chart boards, chalk boards, cork boards, felt boards, easels, magazine racks, newspaper racks ... ,we do all the work for you !! Cork Sheet Bulletin board