Promotional Keychains & Keylights, House Key Chain - Stress Reliever - Polyurethane, House Shaped Polyurethane Stress Reliever Key Chain. Due to their handcrafted nature, stress ball sizes, colors and textures may vary. Factory cannot guarantee consistent imprints or PMS matches. Material: Polyurethane. ... #LKC-HS19 $3.13/each.