The tour is free, however, the guides work for tips. Very interesting to see the silk-making process from start to finish. You really appreciate the work that goes into the pieces you make take for granted. You will learn about the silk worms (spoiler - they keep 20% of each batch, 80% are killed for the silk). You learn the difference between the types of silk - very interesting. The tour is short - 15-20 minutes - and you can visit the gift shop afterward. They claim that all of the profits go back into the local farm, which employs the local Cambodians. There are "work rooms" which you are not allowed into, and I couldn't help thinking "what's really in there?" Overall, I really enjoyed this experience.