You can find models that feature a stamped or fabricated deck, which are made differently and offer their own advantages. Mower decks are made primarily from steel, but you can also find units comprised of aluminum and even composite. Stamped and fabricated decks differ in their construction, thickness, and appearance. Fabricated decks aren't made using a mold and press but instead are multiple pieces welded together. You can spot a fabricated deck by looking closely and noticing the welding beads some models have between pieces at the joints.