These are your run-of-the-mill 1/4 Watt, +/- 5% tolerance PTH resistors. Commonly used in breadboards and other prototyping applications, these 330 ohm resistors make excellent LED current limiters and are great for general use. These thick-lead versions of the resistors fit snugly into a breadboard with very little movement, so you should have few to no issues using them in your next project!
These resistors come in bags of 20. They are the same resistors found in the SparkFun Inventor's Kit v4.0, upgraded from the resistors in previous versions of the kit.