Customized Keychains & Keylights, Brain Key Chain - Stress Reliever - Polyurethane, Brain - Miscellaneous shape stress reliever attached to a key chain.Notes: Picture for reference only. Due to their handcrafted nature, stress ball sizes, colors and textures may vary. Factory cannot guarantee consistent imprints or PMS matches. Material: Polyurethane. ... #LKC-BR05 $1.50/each.