Arabest 16pcs Basalt Hot Stone Set Heater Box Massage Stones Kit Relieve Stress Back PainComplete Sixteen Piece Basalt Set Includes a variety of stone sizes specifically shaped to target the back neck shoulders and legs for a full body experience Integrated Rapid Heater Box Features a convenient portable case that warms the stones to the perfect temperature without the need for water or bulky equipment Natural Heat Retention Properties Crafted from authentic volcanic basalt rock which stays warm longer than standard stones for a deeper