1)Frame :Aluminum, ABS corner 2)nner Material :Corrugated board 3)surface board:YUCAI,P3 and poso board We are the professional ... manufacturer of the writing board from China,include white board,green board,black board,fabric baord,corkboard.Our product ... our product is:high quality and beauty indesign. 1.Features: 1) Surface board:YUCAI,P3 and poso board2) Mezzanine :High-strength ...