Comes in two variants, 9 tons and 12 tons, and can have different numbers, based on requirement

First Stage of PSLV, It uses the S139 solid rocket motor, gives initial boost to rocket

Second stage of PSLV, it is powered by the Vikas liquid engine, one of the most reliable engine of ISRO

Third Stage of PSLV, Solid motor, provieds thrust after atmospheric phase of launch.

Fourth and final stage of PSLV, two liquid engines provides final thrust for satellite injection

PSLV (Polar Satellite Launch Vehicle) is an indigenously-developed expendable launch system of the ISRO (Indian Space Research Organization). One of the most flexible and successful launch vehicle designed by ISRO, launching 100s of satellites, including India's mars and moon missions