Sonex Mini Acoustical Foam is designed for use in environments where high frequency noise control is required. Its unique sculpted pattern allows for a maximum handling of high frequency sound waves. It is offered in two versions, the standard being a melamine foam (part #MSO-1) which is Class 1 Fire Rated and 100% fiber free. The color is white or light grey but there is an option for a painted surface (part# MSO-1P) in charcoal, beige, brown or blue. The second version of Sonex Mini is a polyurethane foam (part # MSX-1) which is more economical, however, not Fire Rated. Standard polyurethane colors are charcoal, beige and brown.