Pulsar RöK Quartz Drop-In Insert | 5 Pack has a rating of 4.3 stars based on 13 reviews.
The quartz drop-in inserts are compatible with the RöK electric dab rig quartz coils. These drop-ins are made to hold smaller amounts of concentrate. For larger concentrate amounts, remove the drop-in and just put product directly in the coil. Features a 12mm outer diameter for an exact fit.
Sold as a 5 unit set so you don't have to clean it out right away after using one and you can have another one loaded up and ready for a friend.
Pro Tip: After each use, wait until the drop-in has fully cooled and use isopropyl alcohol with a cotton bud to clean it out.