This type of promotional coupon is also commonly used. The surface of the coupon is printed CMYK and a deafening agent is applied to the adhesive area on the back of the label allowing for more information to be printed, usually in black These can be used in mailings, on pack promotions, point of purchase, event marketing or as give aways or for internet games. Usually, for internet games a random number is printed on the back of the coupon. Widely used in the retail and promotional labelling sectors for marketing applications