Otterbox Defender Series iPhone 4/4S Replacement Inner Hard Shell in bulk packaging. Closeout special. Compatible with: Otterbox Defender Series Case for iPhone 4/4S. Brand New. The OtterBox Defender Series case outer skin securely wraps around the inner hard shell that contains iPhone 4/4s to keep your iPhone safe. Replacement Inner Hrd Shell Accessory only. Select from Color options: Black or White.