wow I used the 11" on my one rack and I was like wow it larger than I need lol. I made sure I watch my temps lol I don't want fried bps. I guess the 17" must be for the boa sized snakes lol
Make sure if you call beanfarm they have what you need in STOCK and ask 2 or 3 times ! I placed an order with them and they said they had what i needed and come to find out they where out of stock ! Took 3 weeks to get my flexwatt order !