The Types segment classifies pen needles by functional architecture, primarily into safety‑engineered, auto‑retractable, and fixed‑length configurations. Safety‑engineered needles, which incorporate a shield mechanism to prevent needlestick injuries, dominate the market due to stringent occupational safety regulations across major regions, contributing an estimated 55 % of total sales. Auto‑retractable needles, designed to withdraw the needle into the pen after injection, hold a 30 % share, driven by growing clinician preference for enhanced post‑injection safety and patient convenience. Fixed‑length needles, offering a static protrusion length, occupy the remaining 15 % and are favored in low‑resource settings where cost sensitivity outweighs advanced safety features. The distribution of these needle types directly impacts manufacturing complexity, cost structures, and adoption rates, thereby shaping the overall market size and growth trajectory for single‑use pen needles in subcutaneous delivery.