Which of the following is NOT required information when replacing a chainsaw chain?

When replacing a chainsaw chain, it is essential to know specific technical details to ensure compatibility and performance. The length of the guide bar is crucial, as it determines the appropriate length of the chain. The pitch of the chain is also vital; it refers to the distance between the drive links and directly affects how the chain fits onto the bar. Additionally, knowing the number of drive links is necessary to ensure that the new chain matches the existing setup correctly.

However, the color of the housing does not impact the functionality or compatibility of the chainsaw chain. It may provide aesthetic information or relate to branding, but it does not influence the technical specifications required for the chainsaw's operation. Thus, when selecting a new chain, the color of the housing is not relevant and does not need to be considered.