Contractors landscape architects and builders are just a few of the industries that can make good use of this rock shape stress reliever to do marketing. Product is made with superior PU material is wonderful for relieving tension and pent up frustration. Without Sound. No two stress shapes are the exact same in shape, colour or density. Some chips or scuff marks are unavoidable due to variations between shipments and mass productions. Stress Shapes are not intended for use by children or animals.