This volcanic rock set is suitable for spa and wellness centers, offering a complete 9-piece basalt stone kit for essential oil hot stone massages. The heated massage stones are designed to retain heat for extended periods, providing muscle relaxation. Ideal for hot , these natural lava stones enhance the overall massage experience. Features -Color:Black -Material:Lava stone -Size:9.00X7.00X3.00cm/3.54X2.75X1.18in -Size:6.00X5.00X1.70cm/2.36X1.97X0.67in -Size:4.00X3.00X0.70cm/1.57X1.18X0.28in -Natural composition: made from natural volcanic rock, these stones contain essential trace elements and minerals beneficial for the human body -Handmade finish: each stone is meticulously polished to ensure a smooth surface that connects seamlessly with your skin, preventing heat loss -Easy heating: simply soak the massage stones in hot water for about 3 minutes, then remove and place them on the skin once they reach the desired temperature -Versatile use: ideal for use on the neck, shoulders, back, and legs, these stones meet the massage needs of various body parts, suitable for spa and massage therapy -Excellent heat retention: the stones have excellent heat retention properties, providing a warm massage experience that is suitable for spa treatments and massage therapy Package list: 3 x Massage Hot Stones (3cmx4cm) 3 x Massage Hot Stones (5cmx6cm) 3 x Massage Hot Stones (7cmx9cm)