The Types dimension of the market taxonomy classifies metal strips according to material composition and geometric configuration, each influencing cost structure and functional performance. Stainless‑steel strips, representing the bulk of supply, offer corrosion resistance and mechanical strength, making them suitable for high‑throughput surgical and respirator lines. Nickel‑titanium (Nitinol) variants, though pricier, provide shape‑memory properties that enable automatic conformability to mask contours, a feature increasingly adopted in premium reusable masks. Aluminum and copper‑alloy strips serve niche roles where lightweight or antimicrobial attributes are prioritized. Geometrically, strips are offered as flat, pre‑bent, or perforated forms; flat strips are the default for generic masks, pre‑bent designs reduce assembly steps and improve ergonomics, while perforated strips balance rigidity with breathability. The interplay of material and shape dictates each type’s contribution to total market size, with stainless‑steel flat strips leading volume, and Nitinol pre‑bent strips capturing growth in high‑value segments.