although its definitely pricey over anything else, roo is the way to go...you'll hear back from a customer that cow lace wore out n broke before you'll hear it about roo...especially on a heavily used wallet...if the item is more decorative, cow is fine...i also do some fancy knots...i wont do em with anything but roo...ya jus have ta pass the added expense to the customer, and when you explain the options it sells its self...otherwise they may have to pay you to re-lace...worse yet, you may have to re-lace under warranty!!