Natural crystal rock salt is known to improve air quality by increasing the negative ions, similar to the freshening effect of a light spring rainstorm. Sierra Salt Rock Luminaries are individually hand cut to fit a tealight, creating a unique candleholder that glows with soothing candlelight. Cork bottom protects surfaces. Due to the nature of this natural material, each will slightly vary in size and shape. Sierra Salt Rock Luminaries measure approximately 4" wide x 3.5" tall