Biology, Chemsitry and Physics display lettering. Channeling the timeless charm of a classic chalkboard, the black and white lettering creates an authentic and inviting atmosphere. Create beautiful science displays that don’t overstimulate. The Biology, Chemistry and Physics, display lettering comes in two different sizes. You will get a smaller option, where there are two letters per A4 sheet and a larger option with one letter per A4 sheet. You are provided with all letters as capitals and lowercase.