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I borrowed some of these from my mum who swore by them back in the day. I was going to an 80's party and wanted big hair and so she suggested these to me. Big hair is definitely what I got with these. I guess she collected them and they were a bit more popular back then because she had a whole draw of these and said that they were always sold in beauty shops/Boots etc.
The rollers are basically big plastic rollers with some holes in them. I think the holes are there to circulate the air when you dry your hair as they are definitely not there to hold the rollers in place. The name of this rollers is a bit deceptive as as far as I can confer there is nothing magnetic about them unless I am missing a major trick. I believe they are called magnetic as when your hair is wet it sticks to them just like magnets, it does ahve a really good grip as this plastic is the type that does ahve a bit of a texture to it when it meets something wet.
I don't put them in my hair when it is sopping wet just after the shower as my hair is so thick and takes hours to dry and these would never work like that so what I do is dry my hair a little so it is still wet underneath where the rollers will really make a difference and then I roll my hair up in these. These rollers have a diameter of 4cm so if you have long hair like me you will be able to twist it round a few times. Now, these rollers do not stick in your hair like velcro rollers do unfortunately so you will need to use slides in each end of the roller to keep them in place. I have never really had a problem with them falling out.
After putting all the rollers in I dry my hair on high with a hairdryer and then wait an hour or two for it to really dry. Oh boy, the first time I used them I definitely achieved the 80's look I was going for. I had tight tight big bouncy curls which to be honest were a bit too Dynasty for every day but for my party they were perfect. I have used these again but they would really not be part of my everyday routine but in order to achieve curls they definitely did their job!