first the red one on the video is a black and red reversal that I keep for me it is made on the exact size of the 3 ''long'' on the picture posted befor , it need few second to get soaked but once it is hot you can some really deep hit without loosing heat mass .also note that no one have been able to burn the herb inside the bowl . the shorter one (yellow and orange) is a lower profile one that dont need to the few second to get hot as the heat is difused to a closer distance from the herb , of course it get a lil hotter so I can get the herb more brown (and probably if I hit it too deep it will burn). both work great I think , of course a good adjustable torch lighter is a must ! dont worry I have play with the lenght / size of the inside tubing / way to diffuse the heat evenly / bowl size and restriction and the 2 final design are the best I have been able to make . I have also trying to make one that you just need to heat the glass ''element'' an than you hit it but it seem more fragil as the glass is constently heated / cool down .