Trident Aegis Series Case for Samsung Galaxy Tab 4-Retail Packaging-Blue compatibility: Samsung SM-T535, Samsung Galaxy Tab 4 Education Meets Military Standard MIL-STD-810F: vibration and drop (Independently Tested). Inner-layer of shock-absorbing silicone with an outer-layer of hardened polycarbonate, providing two layers of protection. Power-ports and audio-jacks are covered with silicone plugs to keep out dirt and debris. Dust filters protect microphone and speaker bays. Green Protection - recyclable, degradable, and compostable plastic