The silicone necklace is 100% healthy material silicone rubber+anionic powder, reduce fatigue, let you healthier.necklace Health protection silicone necklace1.Material--100% silicone, flexible, nontoxic and non-stick.2.Use -- muscle power up, improve blood circulation, sooth tension ,enhance upgrade the power of concentration, helpful for students, researchers, businessmen or athlete.3.Size can ...