The G1707 (GA‑B2100BBR‑1ADR) is built with a Carbon Core Guard structure, combining carbon-reinforced resin for the bezel and bio-based resin for the band, offering toughness while reducing environmental impact. https://saicreationswatches.com/products/casio-g-shock-ga-b2100bbr-1adr-g1707-analog-digital-unisex-watch