The Rosy Gold Ben Wa Balls are designed for pelvic floor muscle training, featuring smooth metal construction for ease of use. Each ball weighs 3.1 oz (89g) and has a maximum diameter of 1.1 in (2.8cm), making them easy to insert and remove. They include a practical pull ring for effortless retrieval. With a total length of 9.8 in (25cm) and an insertion depth of 3.7 in (9.5cm), these balls are suitable for penetration. They can be used with water-based lubricants and are waterproof, making them easy to clean with toy cleaner and water after use. The product is CE certified and comes with a warranty. Manufacturer: Rosy Gold. Color: Rose Gold. Total weight: 13.3 oz (376g).