Very thin and very tight baby dread??
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A great idea when you T&R is to let your hair naturally separate into sections first. That way the hair tells you where it wants to go. In regards to size, as Soaring Eagle said, they size of the mature dread will be the size of where that section meets the scalp. It will not be the size of what you see right now, it changes, loops, shrinks and thickens up. Whether you let your hair sections naturally, or whether you make the sections yourself, unless you want fat dreads, make the sections 1 inch or smaller at the scalp. This is the ideal size that allows mature dreads to naturally dry within 24 hours. Any fatter than 1 inch can take 2 or 3 days (depending on the size) to fully dry within the center of the dread.
When you do T&R, here is a tip: instead of going Twist Rip Twist Rip etc.....go Twist Rip Rip Rip Twist Rip Rip Rip Rip Twist etc. This way you will not get a braided look at first. Other than that, don't do it really tight.....If you have any questions about T&R, just ask....peace