Yes, there are spiral rollers that may be used for spiral perms. Although, it is possible to use the conventional rollers and wrap the hair in a spiral. Best effects will be acchieved with spiral rollers.
You use the same rollers for a piggyback or spiral perm. You can however choose different sizes. The main difference is how the hair is rolled on the rollers, not the rollers themselves.
Generally yes you do you want to use larger perm rods. You have to do so because you have to have as much space as possible to wrap the hair because spiral perms are generally for longer hair.
yea we have 2 up to 4 kinds of rollers we have the tinny rollers if u like the tinny perm then alitle big rollers for mid perm then 2 type of big rollers those rollers speciel for perm u just know what the perm size is suitable for ur face then choose the size of roller u like