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Here is a basic breakdown of how PLH and dome affect the flight of a disc within the same mold, especially drivers. Watch this 30-second video for a quick overview.

PLH (Parting Line Height): This refers to the height of the seam along the edge of the disc where the top and bottom halves of the mold meet. PLH is one of the biggest indicators of a disc's stability. Generally, when comparing two discs of the same mold, a higher PLH means the disc will be more overstable, while a lower PLH makes the disc more understable.

Dome: This describes the curvature, or "pop-top," of the disc's flight plate. Discs with more dome offer more glide and usually are more overstable throughout the flight. Conversely, discs with a flat top (less dome) tend to have less glide and offer more overstability at the end of the flight. Flat-top discs also tend to cut through the wind better and are often preferred by players looking for a comfortable forehand grip.

Note: Measurements help with comparison, but they do not guarantee a particular flight. Plastic, weight, run, and wing shape also matter.