Freshen up your shelves with the Scented Candle Diffuser! This diffuser has a round candle viewing window in front and a square opening in the back for easily changing the andle. We recommend a 2" tall candle for use in the Scented Candle Diffuser. The inside area where the candle sits is 3-1/2" tall. There is an indented area on top for adding potpourri. Caution: The diffuser may get hot while the candle is burning. Candles not included. Measurements: 4" base and rim diameter, 2-1/4" round candle viewing window, 2-1/4" square candle opening in the back, 4-1/2" tall, 3/8" indentation on top, 3-1/2" tall inside are for andle