1. One piece per month to prevent odor. 2. Made from 100% strong enzymes, it can effectively decompose and digest organic deposits and fats. 3. Keep the drainage system used in kitchen, bathroom and utilities clean and eliminate odors and clogging. 4. Maintain the safety of pipes and septic tanks. Specifications: Quantity: 12pcs Color: randomcolorSize: 10cm/3.94in each Note: There may be slight size deviations due to manual measurement, different measuring methods and tools.