Acrylic plastic strip reflectors, hermetically sealed and impervious to dust and moisture, unfold to a triangular shape and are held firmly into place with a sturdy-locking device Interior strips of molded florescent plastic provide effective warning for daytime use Airflow design helps reduce wind resistance Exclusive wire bracing controls degree of tilt, even in extreme wind conditions High-impact molded plastic box Easy to erect, single triangle flare unfolds from a weighted blow molded tube that serves as a base and is equipped with non-slip foam pads Permanently printed placement instructions on case and triangle Meets or exceeds all DOT standards and requirements of FMVSS125 Dimensions: Triangle erects 17 1/4" wide x 16 1/2" high, base 17 1/8" long, case 17 13/16" x 5 1/4" x 4 5/16"