Beadsmith Slimline pliers. 120mm long. Red PVC handle.
Use flat nose pliers for opening and closing jump rings. The nose of these pliers is smoothly machined, so they don't scratch your wire. Some of the cheapy pliers on the market that you'll get for the same low price, but they won't be smoothly machined.
For small-to-medium hands, the handles are very comfortable. There is a built-in spring, which makes these easy to use ergonomically. If you really use these a lot, eventually the box joint will get a little loose; and that means that you're ready to upgrade to the Lindstrom flat nose pliers. In spite of this, they are good quality and a great value; we recommend these as the best choice economically for beginners.