Designed To House P.C. Boards For Instrument Use. Molded In Light Grey, General Purpose ABS Plastic With A Light Texture And A UL Flammability Rating Of UL94 HB. Two Part Clam Shell Construction. Bottom Half Includes Molded In Standoffs For Easy P.C. Board Installation. Front And Rear Panels Are Interchangeable And Easily Removable For Modifications.