Sarana Tile lists Fitch Rainbow as a 12" x 12" porcelain mosaic. Residentially it works in kitchens, entry foyers and open-plan living areas. On commercial jobs it turns up in retail floors, restaurant dining rooms and hotel lobbies. The nominal size is 12" x 12", listed metrically as 30.8x30.8cm. Sarana catalogues it in Volume 8 on page 91. It arrives mesh-mounted, so the spacing holds while the sheet is set and it trims down to meet a corner or a niche. Sarana prices it by the sheet.