Decals are made of vinyl and are for use on smooth, flat surfaces. Includes 1 large decal with 4 kids standing (35.5" wide x 22" high), 1 teacher, 5 smaller kids, the words "Why?", "How?" and "What?, 1 magnifying glass, 1 "SID the Science KID" logo, and 1 light switch decoration. Includes 3" yellow squeegee as well as full use and care instructions.