Energy ion sports silicone necklace NL-2 1.Model:NL-2 2.Size: Round 52cm; Diameter 5mm 3.Weight: 22.5g per ... piece 1. Material: Soft non toxic silicone with stainless ... for increased focus on those (students)- Vulnerable groups Material:Soft silicone with stainless steel fittingsColor:Black, White, Red, Pink, Blue, CoffeeSize ...