If i ever felt the need to defend myself i would just buy a gun and have it on me..No laws made by people will set me into a box where i cant defend myself or my family..
I em no Bruce Lee so a coin roll would not be good for me, i do know have to fight but against people whit viscous intend a coin role will do more harm then good in most cases..
Sames goes for telescope batons if you don't now have to use it and pull it up, it can make it very bad for you if the person attacking you gets a hold of it..
Best for use easy self defense is pepper spray, it sucks so bad to get that stuff in your eyes and face.. or CS that sucks as bad..
I have been sprayed whit cs,pepper and been slapped whit a big police baton in the face/head, sprays are the most effective..