Formal:
* Mga karayom ng pino (literally "needles of pine")
* Mga dahon ng pino (literally "leaves of pine")
Informal:
* Karayom ng puno ng pino (literally "needles of pine tree")
* Dahon ng puno ng pino (literally "leaves of pine tree")
* Mga karayom (simply "needles")
The most common and natural-sounding translation would likely be mga karayom or mga karayom ng pino.
You could also use the more specific term mga dahon ng pino if you want to emphasize that you're talking about the actual leaves of the pine tree.