Time clocks are extremely easy-to-use machines that cannot possibly be made simpler. However, for them to be of use, there are certain supplies that go along with the machines. This includes ink cartridges, card racks and time cards. There are different varieties and colors of ink cartridges to match both your time clock model as well as your personal preferences. Card racks vary in size as well to fit both small and large work spaces. Different types of time cards are available to correspond with the type of payroll system in your workplace, including different payroll start days and weekly and biweekly charts.