This set contains 40 Clasps – 10 of each color. The clasps are is packaged in a reusable storage box. A lobster clasp is one of the most common and strongest jewelry clasps available and one you’ll notice on most pieces of your jewelry. It gets its name from its shape since the clasp gives the illusion of a lobster claw with the pinching style of the hook. Lobster claw clasps (also called trigger clasps) are one of the most secure clasp options you can choose. They don’t rely on tension to stay closed but have an actual locking lever mechanism. They can’t slide off and can usually withstand a good tug. The lobster clasp is opened or closed by pressing down on the lever, which cause the bottom part to move inside. This space is then used to attache (or remove) a short link-chain or a ring-like structure like a jump ring or split ring. Lobster clasps are often used for necklaces, bracelets, and keychains.