Thanks for your swift reply Sarah,i think i will take your advice and use the 0.5mm for basically product penetration,twice aweek, along with the recommended products, and the 1.0mm once every two weeks to refresh the facial skin and also for the back of the hands which are becoming noticeably and increasingly more wrinkly,rather than have the 1.0mm dermaroller going to waste so to speak lol,and use the 1.5 roller and the 1.5 derma stamp for my quite deepening forehead lines and crows feet once a monthAlthough i have had the 1.5 roller and 1.5 derma stamp for two or three weeks now, i havent got around as yet to use either on my forehead or my crows feet,having said that i havent used the 1.0mm stamp, just the roller on my deepening forehead lines either,just on my crows feet, which after the first session seem to reduce them quite alot compared to what they orginally were before i decided to start this dermaroller/dermastamp process,but didnt eradicate them totally,so would a 1.5mm stamp do this? And also the deepening forehead lines? And if so how many sessions do you think in your own opinion it would take?Or is it just an individual thing and therefore every case is different? Many thanks in advance once again and many congratulations on having a very honest and informative website.