Saunum 5 Boxes x 33lbs, 5-10cm Grey Rounded Olivine Sauna Heater StonesSaunum sauna stones are manufactured from the best olivine diabase raw stone, creating the most enjoyable high quality sauna experience. What's Included 5 boxes x 33 lb box of 2" 4" (5 10 cm) sauna stones Features High Quality Olivine diabase raw stone Rounded, Pre washed & ready to use Durable with high heat capacity Stones range from 2" to 4" (5 10 cm) Specifications Item Number 6418530920714 Construction Material Granite