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Foldable Design: This calculi strainer features a foldable design, folding down to approximately 1cm in height for easy portability. Reusable: This collapsible kidney stone urine strainers can be reused after cleaning and drying. Precise Filtration: The silicone funnel is made of 316 stainless steel (400 microns), effectively capturing stones and debris. Premium Materials: The collapsible kidney stone urine strainer is made of soft and comfortable silicone material that will not scratch your skin during use. Wide Opening Design: The soft silicone funnels have a 4-inch wide opening design to prevent splashing during use.