I am practising SPP but want to get into other techniques too (rocking, zipping, raking...)
I have these Picks:

Are they Bogota?
I have seen Bogota picks but they were kind of rounded for not binding up when raking.
Then I have seen Picks specially for rocking and not raking.
Can I use the picks on the pic for raking and zipping?
The picks obviously have two sides.
What is the upper side of the bottom pick for?