a. plywood of poplar core, okoume face and back, mr glue, DBB/CC grade, both sides slightly sandedb. plywood of poplar core, okoume face and back, standard BB/CC grade, both sides well sandedc. plywood of poplar core,agathis face and back, standard BB/CC grade, both sides well sanded MR glue.d. white birch plywood , poplar core, MR gluee. all poplar