This Set Fits all Toddler Beds and Cribs (Single or Convertible) . The quilt measures 33" x 42", The 4 pcs bumper is 9.5" high, the long sides of the bumper are 52", short sides are 27.95" long. Crib skirt fits 28 x 52 inches mattress. Sheet is 100% cotton, fabric content is exclusive of decoration. Filling is 100% polyester. Battery? no battery used. Comforter with adorable hand sew-on could also used as tummy mat when baby play on the floor for tummy time. Crib sheet is fully elasticized for a snug fit.