The covering or "packing" used for rotary-knife roller gin rolls is very important to the operation of the gin stand and is a major expense item for a commercial roller gin plant. Finding materials that enable faster ginning, wear longer, and are more economical while maintaining fiber quality is an important roller ginning research item. A research project was performed at the Southwestern Cotton Ginning Research Laboratory to compare the performance of a felt material (100% wool) to the conventional fabric and rubber packing. The felt packing wore well, ginned at a reasonable rate, and maintained fiber quality. However, the ginning rate coupled with the cost of the felt packing is not enough to warrant changing from the conventional packing being used in the industry. Further research is required to identify other materials that might be good alternatives to the current packing.The covering or "packing" used for rotary-knife roller gin rolls is very important to the operation of the gin stand and is a major expense item for a commercial roller gin plant. Finding materials that enable faster ginning, wear longer, and are more economical while maintaining fiber quality is an important roller ginning research item. A research project was performed at the Southwestern Cotton Ginning Research Laboratory to compare the performance of a felt material (100% wool) to the conventional fabric and rubber packing. The felt packing wore well, ginned at a reasonable rate, and maintained fiber quality. However, the ginning rate coupled with the cost of the felt packing is not enough to warrant changing from the conventional packing being used in the industry. Further research is required to identify other materials that might be good alternatives to the current packing.