There are many kinds of clarinet swabs, some are good, others are not-so good.
Many new student clarinets come with this type of swab. This is probably the worst type. They really don't absorb well, and they get stuck in the clarinet. Not a good choice for a young student who is just starting to learn about the clarinet!
Here's another one often seen in student cases. I don't like this one either because it can get stuck in the clarinet.
This is what I use - a silk swab with a rubber coated weight. This will not get stuck in the clarinet, and it absorbs well. The brand I use is Gem. They are easily available and not expensive.
For more information on clarinet playing, or to inquire about private lessons in Sharon, MA or Concord, MA, visit my web site: www.elizabethleehey.com.