These magnetic lobster clasps are made of brass with gold/silver tone plating, they are drawn together easily when you bring them near to each other. Locking design and concave structure,once attached, it is difficult to open horizontally.A particular feature that is handy for women with long nails. Pineapple texture metallic finishes, very special, different from ordinary magnetic jewelry clasps. Lighter weight for thinner necklaces/bracelets.They basically don't move at all and do stay in the back.Package included: 2pcs of silver color+2pcs of gold color magnetic clasps.Notes:Because it is a concave-convex structure, the magnet can only exert its maximum magnetic force when it is locked into the correct position. 2pcs silver color+2pcs gold color magnetic clasps,suitable for different necklaces/bracelets. Locking design and concave structure,once attached, it is difficult to open horizontally. Special pineapple texture metallic finishes,different from ordinary magnetic jewelry clasps. One end is a lobster clasp and the other is a ring for easy connection to the ends of the necklace.Light,suitable for thinner necklaces or bracelets Made of environmentally friendly materials, nickel-free, cadmium-free,no skin allergies