Material: Bog-oak. Most of the bog-oak we use is in the range of around 5-thousand-year-old. The Bog-oak is very dark brown or almost black colour, which is its natural colour due to a very old age. We do not use any chemicals to darken the wood. The only addition to the wood is organic olive oil we use for a final polish.Chain: Oxidised or blackened silver. This chain is genuine Sterling Silver. We use a method to oxidise the chain, to achieve a surface dark patina. With time and wear, this darkened effect will slowly disappear, and silver will again shine through. Oxidised effect can be restored, and if you wish to do so, get in touch and we will provide this service free of charge.Process: HandmadeLeko & Leko presentation box included dimension: 167mm x 167mm x 40mm. Leko & Leko Brochure included. Explore Leko & Leko brand, learn some of the specifics about the bog-oak, and keep our contact details if you wish to get in touch in the future.