प (p) series

In the next series of letters, the air is blocked at the lips--they are therefore called labials--as in the sounds "b" and "m."

The first letter is प (p), as in spin.  There is NO aspiration (following puff of air):

Yo

Next comes the letter फ, as in the p-h combination in top-hat.  It has aspiration:

Yo

After that comes the letter ब (b) as in bin.  It does NOT have aspiration (a following puff of air):

Yo

Then comes the letter भ (bh), which is followed by a puff of air. It sounds like the b-h combination in club-house. Like the letter थ, it will cause a gap in the "clothesline" from which the letters hang:

Yo

The last letter is the "nasal" of the group, which in this case is the letter म (m) as in man. It can occur by itself or in combination with other letters:

Yo