This is a dry room technique. Experience and create your own signature ThaiSpa service. The Thai Herbal Ball is a compress filled with a mixture of 12 healing herbs. This is quickly becoming the most popular new treatment in spas around the world. The Traditional Thai protocol is a 3 step procedure which includes pressure points along the sen sib lines or meridians, application of the herbal ball along those same lines and a finishing massage using Thai-inspired aromatherapy oils of jasmine and lemongrass.