Material : 316L PVD Coating 18k gold plated Premium stainless steel Total Length: 44.6cm + extra. chain 5.8cm (adjustable) Maintenance: This stainless steel product is water, sweat, shower, and swim resistant WATERPROOF jewellery. It does not oxidise even when in contact with water and made to last with everyday wear! If you want this to last longer than a year, we recommend that you care your jewellery well. For more details about our jewellery material details and jewellery management, please check this link : https://thefitzstudio.com/pages/jewellery-care Note: The size is measured physically by a ruler, so it could be slightly different