Plastic foot massager 1.the massanger's hardness cancome topebbles road 2.you can massage two times a day,one time in 20 minutes 3.if you are use it at first time,you may feel pain in your feet.Than you can use these method to release it.First,use 3-5 minutes make yourself adapted it,than increase massage time.Second,wear cotton sock protect your feet contact with massager directly,and massge with on sock when you adapt.Third,covered foot mat to massager until you are adapt it. 4,in order to have a good effect,you should drink warm wateror wash your feet by hot water after it. 5.the massager is not suit for little child,it is also not used by women in pregnancy and menstrual phase 6.colors can depend on customer