As a physicist, my scientific calculator is never far away. I've had a few different ones over the years, so in this design I've included my favourite features of each one to make a super calculator! It comes personalised with your name in the top left-hand corner if desired (up to 9 characters). All my items are beautifully finished and are 100% designed and hand made in my solar powered French studio. Approximate sizes: Height: 6.5cm (2.5in) Width: 13cm (5in) Depth: 0.4cm (1/8in) Chain length: 45cm (18in) Materials: Cherry wood vaneer & silver-plated chain. Please note that the grain of the wood varies between pieces and sometime features knots etc., so your piece will be one of a kind. Care instructions: This product is made from wood, so make sure it stays dry and out of direct sunlight. To keep the silver plating in tip-top condition you should keep it away from soaps, makeup, perfumes, and other chemicals.