This is a replacement rear roller for the Expert EX450R A2 Laminator. The front and rear rollers in this model are different, please check your requirements before ordering (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.