I purchased the 2 Blade rage expandables this year and am pumped to use them! Judging by what i've seen on tv and the damage they do I had to buy some. One thing about the O-ring's is that once i run out of them, instead of buying them is is use the little rubber band that i got when i had braces. they are the same thing. If u know somebody with braces just get some from them.....thye have worked fine for me.