Cobra Foam's Replacement Inserts - Locally Manufactured for Protective Cases Premium Polyurethane Foam - Balances Flexibility and Heavy-Duty Cushioning Pelican Storm IM3300 Compatibility - CNC-Machined for Perfect Fit Snug Fit Ensured with Rounded Corners These are replacement foam inserts designed for the Pelican Storm Case iM3300. The foam used is polyurethane, a common choice for cases, offering flexibility for items while providing robust cushioning, even for heavy objects. Polyurethane's open-cell structure allows air and water to pass through freely. The material's density is approximately 1.2 - 1.3 lbs per cubic foot. We also offer custom cutting services for an additional nominal fee.