Promotional Stress Relievers, Fire Hydrant - Stress Reliever - Polyurethane, Fire hydrant shape stress reliever, 3 1/2" x 2 1/2" x 1 1/4". Due to their handcrafted nature, stress ball sizes, colors and textures may vary. Factory cannot guarantee consistent imprints or PMS matches. Material: Polyurethane. ... #LCC-FY15 $2.36/each.