Treble & Bass Clef –30 cards - Major with minor keys named on the back of each card. All ”flashcards for the private teacher or small group” are printed on 4 ¼ x 5 ½ colorful card stock, and are perfect to use in a private lesson or small group setting. All flashcards have a varnish coating to guarantee years of use! 4 1/4" x 5 1/2" (for the private teacher or small group)