TITAN MANIA is a specialty brand of titanium products from Osaka, which focuses on high quality camping gear that will be enjoyed by people who love camping and outdoor activities for a long time. [Product Details] Outer diameter (approximate): 0.7 inches (18 mm), Inner diameter (approx.): 0.5 inches (14 mm), Thickness (approx.): 0.09 inches (2.2 mm), Weight (approx.): 0.03 oz (0.7 g), Material: Titanium, Quantity: 2 pieces. Product Description: Lightweight. Sturdy! Double wall ring made of high purity titanium which is highly resistant to rust. Can be used to change keys, store keys, connect parts and connect! You can choose the size to fit your needs such as charms and other small accessories, or as an original acrylic stand or acrylic key chain, or as a key ring. Great for a variety of occasions, such as repairs, repairs, and DIY projects. Titanium is a lightweight, strong, and highly corrosion-resistant metal so you can rest assured even when using it outdoors. The metal is also used for medical use, so it can be safely used by people with metal allergies.