Here's the pic of the premade - I like the rubber covering the end.
https://ball-pythons.net/gallery/fil...6/flexwatt.JPG
I have it on a dimming day/night thermostat and aside form the fact I have to set the t-stat to 88 to get the thermometer to read 93.6 (they are less than 2 cm apart!!) I have no quibbles with the stuff.
dr del