Annic 18" Silver Plating Snake Chain Necklace, Silver (10 PCS) Annic snake chain necklace has 4 sizes including 18" 20" 22" 24". Comes with 10 pcs in one size per pack The original material is copper. These snake chain necklace are 925 silver plated. Theyre of high quality and sleek design. Suitable for any pendant Best for making jewelry for Moms for mothers day. Very beautiful and well made. They sit at a nice level on the chest and fells good in hand The thickness is approximately 2mm