These are thin-walled silicone eyelets that make your piercing look like a round, open hole. They should not be used to stretch with, as they may be unable to keep a freshly stretched piercing at the new size. The flares on these are not like regular plugs where they come out and around your lobe--they are extremely small flares that barely come out of your piercing.
Note: 10g through 6g can be difficult to work with. You will probably need to exercise patience, as it can require practice to get them in.