Made from high-quality 314L stainless steel. Stainless steel is not only one of the most durable metals in existence, it is also non tarnishing, waterproof and hypoallergenic, making it perfect for those with sensitive skin. 
One size fits most, as it is adjustable. 
Size 15cm (6 inches), plus a 5cm extender, allowing for a total possible length of 20cm (7.9 inches). 15cm is typically suitable for a child or very small adult. This makes it a perfect gift for a child, as the extender allows for additional length as they grow.