I am presently at Jodhpur on my annual leave and have spent over a week.... about a week more to go.  Purchased my Hitec Aurora 9 radio and some Balsa and the best propellers one can buy.  Got my 8x6, 9x4, 9x6 and 10x6 nylon propellers. 
These propellers are half the cost of generally available propellers in the market and excellent to use.  Also available in Glass Filled Nylon versions for Glow Plug engines.  I have used them for many many decades....... well been using these since early 1980s and I prefer these propellers over any other propellers.  SHarma's being the pioneer of Aeromodelling in India have been suppliers of aeromodelling good since late 70s or even before.

Well I recommend these for all model flying.  They are also available in 12x6 size.

Sharma ji is a good manufacturer of propeller and used his props for two years during my Aeromodelling training.
But now i use master Airscrew propeller because nylon prop are not well balanced and cause more vibrations.(Because i need to sand hole to be fit on .46 OS)
I realized this when i used 7*6 Master airscrew prop on .15 glow engine instead of nylon prop.
Less vibration gives more accurate tuning and life of model.

Well... you must be talking of the general props he makes.  They are Glass Filled Nylon.  I got special soft nylon propellers..... have used them for long in Nylon and ......... well you need to balance all propellers if you are into balancing them before flight...