Is it normal to feel one saline implant? Not on the outside, I mean I can feel it wrinkle when I massage it.

It is not uncommon to feel the 'wrinking' or 'ripple' of an implant in saline or silicone implants especially if you have very little breast tissue to begin with. 

Thank you for your question.  This is relatively common for a saline implant.  They have a more firm and often wrinkling feel at the edges compared to a silicone implant.  Silicone will have a more natural feel.  

This is a very common finding and is often present in many patients for a number of reasons. First of all, when you take something soft and stand it up on end it is normally going to have some collapse or give to it which can be felt as wrinkling. Most devices, especially the softer ones, will have some collapse and wrinkling in them. The ease with which someone can see or feel the wrinkles depends on how much breast tissue someone has to cover an implant and just what size implant a patient wants to have. There is often a trade-off between quantity and quality and as the implants get bigger the patients tissues get stretched thinner and it becomes easier to see or to feel the implants. The fact that you can feel one more easily than the other is not that unusual and may change over time. I would encourage you to check with your surgeon to make sure that everything seems normal for your body and the implants that you have.