Pelican Protector Case 4 pcs for 1651 Replacement Foam SetThe foam set is an easy do it yourself system for customizing the interior of your case. Layers of foam are pre scored in tiny cubes. Simply lay your equipment on the foam, tape or chalk to mark the foam, and pluck away. Always allow at least one inch of foam between your equipment and the wall of the case. Features: (1) 4. 4 cm Polyurethane Convolute lid foam (2) 9. 5 cm Polyurethane Pick N Pluck (. 63" x . 63" squares) base foam (1) 2. 5 cm