>>656398 there are tradeoffs with elastic type.
tubular bands tend to be more resistant to abrasion ( in and out of pockets and bags etc) but have a higher draw weight- it's very VERY important to note that with slingshots a higher draw weight does not mean a better power output. thick tubular bands like the ones the Trumakrs come with hold a LOT more energy but this is only really worth while tapping if youre shooting incredibly heave (comedy level) ammo, upwards of 100g get on Google and look up the Chinese Dankung style tubes, far thinner and do the job
flat bands tend to be faster ( the rubber is thinner, and can contract faster) but need more care. I tend to use these on stuff I know I'm going to be taking out for a reason ( inc the Hayes Seal Sniper for plinking)