Hey Smitty, Yep Its 1/4 inch Baltic Birch and it is exceeding strong. I understood the conciept years many years ago in the contruction industry that it is better that a good tool fit your hand. Most of my work consisted of using a circular saw and when I put my hand to a Worm Drive saw that was it I would use that till I cut my last board. And so it goes with these shooters. I was dissatisfied with the thick excessive shooters that never flet like it belonged till I began to use various thickness of plywood. I went through the entire range even used a 1-1/8 thick but when I got to the 3/8 it was right enough but I tried 5/16 then 1/4 inch thick and this was the very best to have strength for any band and even fork wont break it unless you shoot hex nut which I strongly discourage. But the 1/4 inch actually feel like it is part of the hand and you will be pleasantly surprised at how well you will do with it. I would say for you to at least try the 3/8 thickness and I also do not see a need for notching. The bands can slip with notching but my bands never ever slip without the notching. I find that the bands have a very good grip flat against the wood as it is. If you do try it let me know and send some video of your shooting.Looks like 1/4" thick wood? Why do you like your slingshots so thin? I like to make mine to be at least 3/4" up to 1" in thickness. It isn't for strength, I just like the feel and weight. Maybe I should try making some out of 1/2" to see if they would work for me.