It is a quite new invention of shape memory polymer, which looks like a nail in appearance, and you can see the shape changing when dropping the shape memory polymer into the hot water(about 65℃ or 150℉). The shape memory polymer quickly memory its original shape and get its shape recovery in 2-3 seconds. br br This shape memory polymer was developed by Manborui, which specialized and dedicated in researching the low-temperature shape memory polymer. br br Please feel free to contact www.china-mbr.com to know more shape memory polymer products.