For 50 years, Dainichi Corporation has been manufacturing solid sponges. The concept: Living smartly, wonderfully, and comfortably. Design: Durable and wear-resistant/Effectively removes tough stains/Excellent foam production and fast draining/Safe for all types of dishes. Single-layer structure: soft and adaptable /Comfortable hand/Cleans deeply, even inside the lenses. Compact packaging/Compressed to a thickness of 7 mm/... Minimum duration of use/Order: 4 products per color minimum. Made in Japan.