Eckoustic Correctional Panels (ECPs) and Type HD Eckoustic Functional Panels (HD EFPs) provide a convenient, effective means of reducing noice levels and reverberation in jails, prisons, detention centers, and other correctional and high-security facilities. ECPs, from Eckel Industries, are ruffed, 2 1/4-inch-thick, flat sound-absorbing panels that feature a unique security fastening system. Installation on walls and/or ceilings is simple with no need to relocate existing utilities. HD EFPs provide an excellent way for easily and quickly reducing background noise and reverberation in dining halls, dayrooms, libraries, recreational areas, auditoriums and visitor facilities. The standard surface finish of ECPs and HD EFPs is white polyurethane enamel with a selection of colors optional.