Features: Craft from silicones and PA66, this impact balls ensures long timing performances and resiliences in various underwater conditions. Experience underwater adventure with our elastic impact balls for diving cylinders, designs to enhances your diving experience with its innovative design and functionality. Ideal for both entertaining diver and professional underwater enthusiasts, this product caters to a wide ranges of users seek enhances safety and enjoyment. With its easy installation and suitable for most diving cylinders, this impact balls is a must having accessory for water sports experience. Perfect for use in swimming pools or open water environment, it adds a extra layer of fun and security to your diving activity. Specifications: Materials: Silicones+PA66 Color: As The Picture Shows Package Weight: approx.40g Circumferences: approx.45cm/17.71in Ball Outer Diameter: approx.3.30x3.6cm/1.29x1.41in (More Size Detail, Please See Picture.) Package Includes: 1Pc Elastic Impact Balls note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!