Spring-loaded design: makes it easy to secure cords, ensures your cord stays tight and secure, and helps prevent cords from slipping. Dual-hole cord retainers: each retainer measures 22mm in length long. Each hole is approximately 6mm in diameter, thus fitting most types of lanyards. Durable Lanyard Fixings: Made of strong and sturdy POM plastic, lightweight and not easy to break to ensure a better durability. Usage: These spring cord fasteners can be used for lanyards, luggage, shoelaces, clothing, backpack cords, hood drawstrings, tents , sportswear, coveralls, boots, etc. Contents: 40 black fasteners for drawstrings, cords, tensioners, etc. Note: Small items not suitable for children under 3 years. Product Description Notes: Small parts, not suitable for children under under 3 years old. Features: With a spring-loaded design, firmly keep your cord tight and secure. Spring loaded lock cord lock for easy use. Made of sturdy plastic, durable for use and not easy to break. Nice oval