Clearsonic St2448 Sorber 24" Wide x 48" Long x 1.6" Thick Trapezoid Top Side 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 STS4 is a 4' x 2' side section SORBER panel, constructed from fiberglass and covered in a dark grey, heavy duty "car trunk" cloth. The panel functions both as a