Non-halo flame retardant foam does not use halogen flame retardants. Environmental flame-retardant foam; Excellent sound absorption; Passed the test of flame retardant (UL-94) (HF-1); Reduces sound reflection, slightly reflected sound is directed in different directions; Size: 19.7 x 19.7 x 21.7 inches (50 x 50 x 5.0 cm); Package size: 10.2 x 2 inches (2 inches (2 inches (2 x 55555 inches (2 cm).