Fill in the blank: 'Discs of _____ and under can be any color.'

The correct answer is that discs of 10kg and under can be any color because the International Powerlifting Federation (IPF) regulations specify that color is not restricted for weight plates of this weight and lower. This allows for a variety of colors for smaller plates, which can be useful for distinguishing them more easily during a competition or training. The use of colored plates is often applied to lighter weights to help athletes quickly identify the load on the barbell, contributing to better clarity during lifts.

In contrast, the heavier plates typically adhere to standardized colors as designated by the IPF to maintain consistency and clarity in competition settings, which is why other weight options do not meet this criterion.