Star Trek Gray Tribble - New Dual Sound Version - Large Size New Dual Sound Version with BOTH Cooing AND Agitated Sounds! The Softest Electronic Tribbles Ever Made - features the Both Original Sound FX from the Classic Star Trek episode, "The Trouble with Tribbles" Large Size Tribbles are 7" x 5.5" x 4.5" Sound and Vibrating FX activated by BOTH Touch and Sound - Clap and The Tribble will come to Life! Hidden Velcro Pouch Safely Hides Electronics