Clearsonic S1266 Sorber 12" Wide x 66" Long x 1.6" Thick Top Center Lid SectionThe ClearSonic Lid System is designed to substantially reduce sound that would normally escape upwards and is especially helpful in spaces with high ceilings. In most cases, the lid system consists of three sections, a center section that comes with a support bar and two side sections. The STC512 is a 5. 5' x 1' center section SORBER panel, constructed from fiberglass and covered in a dark grey, heavy duty "car trunk" cloth. The panel functions both