Size and quantity: 2.5/3 cm outer diameter, 2.5 cm/1 inch inner diameter, 0.3 cm thick and 100 pieces in total, enough for your different needs. Sturdy and durable: all flat silver keyrings are made of metal alloy and plating on the surface, sturdy and well sealed, not easy to scratch and will hold several keys securely, will not rust after long use. Safety: the key rings are flat and tightly closed to prevent the key rings from slipping. Flexible stainless steel openings allow easy installation of any key ring without the need to separate with great force. WIDE APPLICATIONS:These silver key rings are suitable for organizing your home, office building, and DIY accessories, and are also ideal for car key rings, lanyards, pet tags and other DIY projects. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.