Stamps - are approximately 2 1/2 x 3 1/2 and are sized according to the number of characters requested. Round Stamps are 2 1/2 in diameter and do not contain characters. Stamps include choice of 5 characters and heads. There is an additional charge for each character/head over the limit. Stamps are available as either Self-Inking (choice of black, blue, red, green or purple ink) or rubber (no ink color choice). Black will be used for self inking stamps if a color is not selected.