What the visit includes
The tour listing shows pickup, transport and a guided visit, departing from Cusco and lasting 5 hrs 30 min to 6 hrs. It is a long half-day tour, so reserve the whole morning or afternoon and do not schedule anything right after.
The four ruins
The four ruins are Sacsayhuaman, Qenqo, Puka Pukara and Tambomachay. Circuit I of the Cusco Tourist Ticket, published by COSITUC, lists those same four sites. For the order of the stops and the exact times, check what the tour listing says when you book.
Which admissions you pay separately
According to the tour listing, admission tickets to the cathedral, Qoricancha and the four ruins are not included. So it is worth deciding before you travel how you will cover them, and checking whether the tour leaves them out or whether you will have to buy them yourself.
How to combine with the Tourist Ticket
COSITUC publishes a comprehensive ticket, which covers the three circuits, and partial tickets, which cover only the circuit indicated. Circuit I is the Sacsayhuaman one. Compare the options and their validity in the official fee schedule before buying, and check the ticket page on this site.