Custom Stress Relievers, Doctor - Stress Reliever - Polyurethane, Doctor shape stress reliever, 3 5/8" x 1 1/8" x 1 5/8". Due to their handcrafted nature, stress ball sizes, colors and textures may vary. Factory cannot guarantee consistent imprints or PMS matches. Material: Polyurethane. ... #LAN-DC01 $3.19/each.