Power necklaces are one of the most popular and prized sports accessories. Now you can experience the power too! These Ion•D double strand necklaces feature a silicone core infused with titanium, a material believed to help increase energy levels, promote pain relief and stabilize energy flow. Plus, they're infused with negative ions that help deliver more oxygen to the brain by counteracting the harmful positive ions we receive through cell phones, computers, fluorescent lighting and more. No medical claims expressed or implied. Size 22.5 Inch