Sonic Rocks (R) Gunmetal colored stress rocks for stress relief, comes in metal case with fitted insert and gift box. Winner of the 2007 Most Fun/Coolest Product in the Advantages New Product Showcase at the ASI Show Orlando. Rocks measure 1 3/4" long, case measures 2 1/2" sq. Attention getting unique stress reliever. Cool way to get your message on people's desk and in their hands. Lifetime Guarantee. Supplier is QCA certified.