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As a manufacturer specializing in sports equipment R&D, Inn Chen MFG  crafts weighted sand balls  from medical-grade soft PVC, offering both flexibility and long-lasting durability. To help users extend the lifespan of their equipment, please follow the maintenance recommendations below. Material Characteristics & Cleaning Guidelines 1. Daily Cleaning After daily use, rinse the equipment with clean water.For stubborn stains, use a small amount of mild soap or dishwashing dete