Spy Labs Incorporated's activity kits and equipment provide an engaging and interactive way for kids to learn about detective work, including forensic analysis and tracking techniques. Includes two unique pens that allow you and your fellow agents to exchange secret, confidential messages. The pens use a special ink that becomes invisible once dry; write a secret message with one pen and rest assured: only the other pen can be used to reveal what you wrote! Promotes pretend play as kids ages 8 and up take on the role of detective, setting out to unravel mysteries one tough case at a time. Become a first-class secret agent with Spy Labs, the Detective Gear Experts; your trusted source for all your essential spy tools and gear!