Individual, Flare or Cluster lashes are one in the same.  Your choices are synthetic or sanitized human hair, the color - black, brow, silver, gold and so on, the length can be listed in mm or under, short, medium and long..  These lashes are commonly sold in a tray that hold 56 to 60 lashes depending on the manufacturer.  The packaging can very - from no package, box or plastic case

 this is a picture is of Synthetic flare lashes that have a knot.  If you look closely you can see how flare is not tappered.

  Flare Long Black try of 60 lashes and the packaging in a plastic try.

  this a picture of Knot Free Flare Long Black

Back in 1987 when I was taking my training to be an esthetician these lashes were called Individual lashes.  I have since learned that they are also referred to or know as Individual, Flare and or Cluster lashes. 

Then I learned I had a choice of knot or knot free.  I have come to understand that these products are a personal preference, depending on the service you are offering.

I then learned that some professional prefer sanitized human hair lases because they feel it interacts with the glue better than the synthetic lashes.

Flare lashes is a service that once you are proficient at it, it only takes 20 to 30 minutes per client.  This service is less time consuming so the price for this service is cheaper than Eyelash Extensions.  Offering both services will make you a more full service eyelash technician.  The more services you have to offer the wider range of cliental you will appeal to.

If you do eyelash extensions you know that once in awhile you will come across a client that is missing a few lashes, leaving a hole in their lash line.  You can use the Individual, Flare or Cluster lashes to fill in the space.

Some clients want a more fullness to their lash line but amount of the lashes they have make it impossible to meet the objective with eyelash extensions a lone.  The individual, flare or cluster lashes can help you meet your clients needs.

I hope this information has been helpful.  Thank you for your time.