| With 8 grooves it would be no bigger than a large sized heat mat .
It does not get that hot , as the grooves are under the cage in most cases and it warms through the timber , if i do put the grooves inside i put lino tiles over the cord and it holds the heat well ...
I always have plenty of cold end in the cages any way , so the snakes can pick hot or cold as they like.
I have 1000's of photos of cages but none that show the grooves sorry . | 
