Update: Due to a problem with the hosting website, this pattern has been lost. Though I am trying to resolve the issue, this pattern is, at least for now, unavailable.
This pattern can be made with any combination of yarn and needle sizes. My recommendation would be to use a needle that is 2-3 sizes smaller than the recommended needle for the yarn you are using. This will assure a tight knit that won’t allow the fill to show through.