Ordering Description Product number Description: OK Weartrode 50 2.5x350mm Product number: 8350253030 Description: OK Weartrode 50 3.2x350mm Product number: 8350323030 Description: OK Weartrode 50 4.0x450mm Product number: 8350404020 Description: OK Weartrode 50 5.0x450mm Product number: 8350504020