Compostable & Biodegradable Machine Covers 100pcs per box. 1. PLA (polylactic acid) are proposed such as corn, cassava starch material, has good biodegradable properties, 2. After use, it can be completely degraded by microorganisms in nature under specific conditions, and eventually generate carbon dioxide and water without polluting the environment. 3. The packaging material is recycled kraft paper from the United States. Main material: PLA Size: 130x140mm Quantity: 100pcs Suggestion: use within 8 months. Note: please store in dry, normal temperature environment, humidity and sun will accelerate the degradation time.