- Cone sizes directly correspond with the sizes of the Buchanan Heat Pluggers. - Once the initial down-pack is complete, backfill cones perfectly fill the plugger void. - Tip diameter for the pluggers and backfill cones is .5mm, so there is no need to "snip" them. - Backfill cones have a non-standard, continuous taper and are shorter than typical gutta percha. **For further product information , please contact Chat Support**