The MiR Mosaic Waterjet 9" x 9.9" Wooden Grey & Athens Grey & Glass Interlocking Natural Stone Polished Irregular Mosaic offers a captivating blend of materials and finishes for your tiling needs."Wooden Grey" and "Athens Grey" likely refer to types of marble or natural stone, with "Wooden Grey" possibly featuring a wood-like pattern or color variation, and "Athens Grey" likely presenting a shade of gray associated with marble from the Athens region. The combination of these two stone types can create a visually dynamic mosaic, with contrasting colors and textures.