Replacement Foam Set for 1550 Foam Sheet Type Convoluted Foam Sheet Thickness 228.6 mm Sheet Width 18 in Sheet Length 21 in Sheets per Case 4 Sets per Case 3 Overall Thickness of Set 9 in Foam Square Length 21 in Foam Square Width 18 in Overall Foam Square Size 21 in L x 18 in W x 9 in H