Invisible Self-Defense Ring This titanium self-defense ring with a hidden knife for Female Emergency Anti-wolf Weapon Best Gift for Women /Men. It can be used for style and as a good self-defense tool at the same time. (Please use caution, the blade is extremely sharp!) Please Note: This ring is crafted in standard US full sizes (7, 8, 9, 10). If you select a half size (6.5, 7.5, 8.5, 9.5), we will send half a size larger along with a free soft silicone adjuster. Made from ultra-soft, skin-friendly silicone, it’s invisible and super comfortable, bringing the ring to a perfect fit. (Please refer to the 8th picture for the international size chart) Material Core Material: Premium Titanium Steel — engineered for maximum strength, scratch resistance, and long-lasting durability Luxurious Finishes: Available in 14K Gold Finish, Rose Gold, Classic Silver, and Sleek Black — all applied with multi-layer PVD coating for rich color Water & Sweat Resistant: Built to withstand daily exposure to water and sweat, preserving its brilliant shine and finish through everyday wear Hypoallergenic & Safe: 100% lead-free and nickel-free, gentle on sensitive skin for effortless 24/7 wear Everyday Defense, Elevated: Fine-jewelry aesthetic seamlessly blended with discreet personal security Package: 1 x Self defense ring 1 x Gift box Free shipping worldwide. To North America/Europe takes 10~13 days To Asia takes 5-7 days. Other countries take 10-30 days, depending on location. The tracking number will be provided by email.