Hello Miller55,
The blades themselves act as stiff leaf springs, similar to a suspension in a vehicle. No they do not need a specific holder. You simply buy "SB4" blades for the "SB4" holder, "Epro" style blades for the "Epro" holder...etc...etc for all the different styles and shapes of holders/blades out there. In terms of blade/holder damage, no issues here. We have done lots of lab testing before even launching to make sure this is a non-issue via typical high volume cyclic loading tests. To add further comfort, we have had a wide range of players on our steel, be it from your average 5 year old to your NHL player and everything in between and havent had any issues. It does not add "stress load" to the holders, as all forces are transferred through steel, to holders, to boots, to your body anyways, so the same weight/force you apply with normal blades is the same as ours. Only difference is that, the flex force in our blades actually reduces stress shock from your knees and joints by reducing the "shock" or impact initial load via the spring technology. Its meant for performance and health. Bug me if you have any other questions, happy to help 🙂 Cheers!