49 cm Purchased November 2024. Selling because I no longer use it, hoping someone else can. An erg necklace with a stainless steel wire type, pursuing a comfortable feel and wear. Thin, strong, and doesn't easily slip. Washable. Erg-processed aluminum alloy attachment. Each attachment is made by cutting and finished with anodized processing, resulting in a vivid finish. By hermetically sealing erg powder and incorporating rare seabed minerals as a new material, further performance improvement can be expected. Erg Synapse Necklace SPACY