The 'Grooved Rings' are aluminum rings recycled from war devices, with unique engravings that make them special. Lightweight, unisex and nickel-free, suitable for everyone. Water resistant, perfect for any occasion. They add style to casual or formal outfits. Sustainable and ethical, ideal for a unique and elegant look. You can find three different sizes: 1.6 cm in diameter corresponds to a 10 Italian size, 1.8 cm which corresponds to a 17 and the 2 cm which corresponds to a 23. The rings are sold individually Given the craftsmanship of the production, it is possible that there may be differences in diameter up to a maximum of 0.5mm