These jump rings are strong enough to hold your elements, but flexible enough to open and close by hand. Attach just about anything to your project with ease! Package contains 75 jump rings - 39 large (3/8") size (13 each of antique nickel, antique brass, and antique copper) and 36 small (5/16") size (12 each of antique nickel, antique brass, and antique copper).