Funny that, I bought some 10cm ones for the first time last week for the same reason. I bought them to start a couple of autos and clones in as I thought the ones I bought were thinner than most as thats what the seller said. The tops are really thin but further down they're pretty think and will certainly restrict the roots. You can't use them as they are. I'm going to try and put some holes in mine,tear them up a bit. I did think about those thin white cloth type pots that are made for transplanting but I went with these.I also lokked at the small fabric pots as they say they're fine to transplant.If its only for a couple of weeks I'd go with the thin white see through cloth ones and if its more than a few weeks the black fabric ones look better as they're stronger.Not sure about how well they'll do in the soil but should be fine.Can you not put them in the final pot?Iv got good results with coco in the final pot in my garden a number of times with autos.3-4oz and thats in the UK with crap weather,ha.I did have them under a light for the first few weeks though.You will need to water coco daily on hot dsays when they get bigger though.