Why is India conceding so few runs?

Their bowlers have consistently kept the opposition below 140, every game so far. What's causing this?

Aerial and Stumping !

Ashwin 8 , Mishra 6 , Jadeja 2

Spinners doing darn well, basically. Mishra's been bowling pretty well himself, and Ashwin's stepped up his game too. Jadeja is more than handy as well. And Bhuvaneshwar Kumar has kept things tight as well IIRC.

And all quality spinners have done well actually - Tahir, Shakib, etc.

The highest that india has ever conceded is 138 and irony is that,it was made by Bangladesh.But ON TOPIC,the surface aids the spinners and they have stuck to their line and length and apart from that,they have deceived the batsman in flight.