Why do metal window frames need a rubber spacer around their edges?

Well, darling, metal window frames need a rubber spacer around their edges to prevent metal-on-metal contact, which can lead to corrosion and damage. The rubber spacer acts as a buffer, absorbing shock and vibrations, and also helps with insulation by sealing out drafts and moisture. So, in a nutshell, that little rubber spacer is the unsung hero keeping your Windows intact and cozy.