Material segmentation evaluates the composition of stress balls: polyurethane foam, silicone gel, PVC, natural rubber, and composite blends. Polyurethane foam, the most prevalent material, supplies 50% of units due to its cost efficiency and ease of molding, supporting large‑scale corporate orders. Silicone gel, valued for its durability and consistent deformation, contributes 20% of revenue, aligning with therapeutic and premium consumer segments. PVC‑based balls, offering vibrant coloration and rigidity, hold a 15% share, largely distributed through promotional channels where branding visibility is paramount. Natural rubber, prized for its eco‑friendly profile, accounts for 10%, driven by environmentally conscious purchasers and niche retail outlets. Composite blends, integrating recycled polymers with foam cores, represent the remaining 5%, reflecting early adoption of sustainability initiatives within the market. Material choice directly influences price points, performance attributes, and regulatory compliance, thereby delineating each sub‑segment’s contribution to the total market size.