Whenever businesses announce sales, they always do so with enormous discount signs in red or any other contrasting colour in order to grab potential customers' attention. Whatever product's price is being discounted, owners like playing around with different shapes and designs.
Here's what's most important - the discount sign must be visible from a major distance. It is essential that this sign at the very least includes the words "Discount" or "For Sale" but, more often than not, we can see this coupled with the reduction percentage and perhaps a list of the products to which it applies.
4.1 x 2.4 in