Custom Stress Relievers, Owl - Stress Reliever - Polyurethane, Owl shaped stress reliever, 2 1/8" x 2 1/2" x 2 3/4". Due to their handcrafted nature, stress ball sizes, colors and textures may vary. Factory cannot guarantee consistent imprints or PMS matches. Material: Polyurethane. ... #LNA-OW01 $3.07/each.