Size: 40x150cm Material: Natural cobblestone Density of cobblestones: Middle density Distance between cobblestones: about 20mm Size of cobblestones: about 20mm Color of cobblestones: mixed Weight of the mat: 5000 grams Funtion: 1. Good for middle age, senior, olders and people sitting to work and study for long. Usually walking on massage mat can improve the micro-circulation of foot, which is said to be the second heart, so that to get better irritative effect to the end of nerves and enhance to get better propitiatory affect to the spirit. 2. According to traditional Chinese medicine and world widely recognized reflexology principle, stimulating or regulating the reflexes or acupoints in the feet helps to reduce tension, improve circulation and promote natural function of the related areas. Note: * This is not medical instrument. Please ask for doctor's advice for serious illness. * Not fit for those people has the symptom of haemorrhage to use during the period of haemorrhage. Such as hemoptysis , have blood in their stool , hemorrhuage stomach and intestine from womb , viscera etc. * Not fit for women at the period of menstruate and pregnancy. * Not fit for patients at the moving period of phthisis , at the unsteady state of acute myocardial infarction, with serious kidney failure or serious heart failure. * Please do not expect any immediate effect. * Foot will feel pain at the beginning. Please wear socks or put a towel on the stones. * Some cobblestones may fall off during shipment and after a certain time. Please stick it again with glue. * We use natural cobblestones to produce the massage mat. Each piece of cobblestone is exclusively unique in the world. The massage mat you get may have small differences with the image here.