18 LENGTH - Standard 18 AlumiCrafter comes with a raised cutting edge and finger groove for protecting your fingers while cutting UNIQUE DESIGN - AlumiCrafter's unique deckle edge with center-finding calibrations makes a beautiful natural-looking border PURPLE STRAIGHT EDGE RULER AND MEASURING TOOL - Our superior-quality silver extruded aluminum is imprinted using photo anodizing process that makes for a uniform finish and color, through this process calibrations become a permanent part of the aluminum and will not wear off over time DURABLE CONSTRUCTION WITH NON-SLIP BACK - Quality construction uses a recessed non-slip neoprene backing that keeps the AlumiCrafter in place with just a light touch ALUMICOLOR IS QUALITY - Each AlumiCrafter is made with the highest quality extruded aluminum and features photo adonized calibrations that won't rub off over time