This is a replacement roller for the Expert EX320R A3 Laminator. All of the rollers in this model are the same and interchangable (please note that the front and rear rollers are connected to 2 different sets of cogs.)
You will only need to replace your rollers if there is an excessive amount of plastic build up on the roller, causing your laminations to stick and jam. This build up of plastic and adhesive (properties of the lamination pocket) is normal.
Before purchasing a new roller, check out or help guides, to see if the problem can be fixed without the need for extra parts.