This stainless magnetic necklace in our line of quality magnetic jewelry has superior 4mm diameter 5200 gauss magnets in each link. This magnetic necklace has a 1/4" wide x 9/16" long link with 33 rare earth magnets in 20" length. It has a magnetic therapy pull strength of 1395 grams. Magnetic necklaces are the strongest magnetic therapy for Head (headaches, migraines, allergies), neck (bulging disk, tension, whiplash) and shoulders arthritis, bursitis, tendinitis, frozen shoulder). However magnetic necklaces often help back, arm, hip and knee pain. Stainless magnetic necklaces lay the best when worn around the collar bone.