Roller gins are machines used in the cotton industry to separate cotton fibers from seeds. They consist of a series of rollers that crush the cotton bolls, allowing the fibers to be extracted efficiently. This process is essential for producing high-quality cotton for textiles and other products. The invention of roller gins significantly improved cotton processing compared to earlier methods, such as the cotton gin invented by Eli Whitney in 1793. Roller gins are known for their ability to minimize damage to the cotton fibers, resulting in better quality and higher yields for cotton producers.