GreenBroz Model M Bottom Blade (Teflon Ring Included)Replacement Backup bottom blade for your Model M Dry Trimmer. Keeping extra blades on hand allows you to swap them out from strain to strain (reducing time in between runs), or simply replace them if you run into any issues. Please note this replacement Model M Bottom Blade comes with a Teflon ring installed. The Model M Dry Trimmer does not require lubrication as the Teflon ring is all that is needed.