Welded jump rings,so the necklace is very strong will not be broken.(Broke occur within three year replacement.) Durable colors,The heart beat necklace can't rust or eroded,it made of high-quality 316L stainless steel. Length:450+60mm (20"),Pendant dimensions:35mm x 25mm,Color: Silver-Tone, Perfect gift for anyone in the medical profession. Expressing love to sweethearts,spouses or friends.Beautiful Heart Beat Electrocardiogram EKG Rhythm Necklace. This is a wonderful gift for anyone in the…