Material: Made of high-quality lightweight foam material, the surface is covered with colorful high-quality waterproof fabric Weight: Approximately 0.6kg for adults, approximately 0.3kg for children Size: Adult model outer diameter 720mm, inner diameter 440mm, children's model outer diameter 530mm Inner diameter 270mm Large, medium, small sizes Colors: red and white, blue and white, green and white, blue The product is corrosion-resistant, resistant to high-temperature impacts, not easily deformed, and not prone to fading Scope of application: water recreation, ships, swimming pools, scenic areas, water rescue, etc A lifebuoy is a type of water rescue equipment, typically made of cork, foam plastic, or other lightweight materials with a low density, wrapped in canvas, plastic, or similar materials. Lifebuoys used for swimming practice can also be made of rubber, filled with air, and are also called rubber rings. Performance: The lifebuoy should withstand high and low temperatures, and should not wrinkle, crack, expand, or decompose. The lifebuoy should not show any signs of cracking or breakage after being thrown from the specified height. The lifebuoy should be oil-resistant and free from wrinkles, cracks, swelling, or decomposition. Lifebuoys should be fire-resistant and should not burn or continue to melt after being exposed to high heat. The lifebuoy should be able to support a 14.5kg iron block and float continuously in fresh water for 24 hours. The lifebuoy, when suspended freely, should be able to withstand a weight of 90kg for 30 minutes without breaking or suffering permanent deformation. For lifebuoys equipped with a self-igniting smoke signal and a self-lit floating light attached to a rapid-release device, the device should be able to be activated upon release. When the lifebuoy is freely suspended, it should be able to withstand a weight of 90kg for thirty minutes, and during this period, the lifebuoy will not burst or deform.