Straight
Absolutely straight as a pencil. This is not a logical choice for 99% of all men's hair styles because it will stick straight out if it is not long enough to create the weight to make it lay natural.

Body wave (36mm)
1-1/2 inch rod size will open to approximately 3 inch wave. This very light bend will definitly not work well for a brush back style. When it is cut short, it will appear very straight.

Slight wave (32mm)
1 inch rod size will open to approximately a 2 inch wave, light movement or body will remain. When this is cut 2-1/2 inches or shorter it will appear to be almost straight. Any wave curl less than this will not have body.

Medium Wave (25mm)

7/8 inch rod size will open to approximately 1-3/4 inch wave. This will be a light wave and is the most common wave used for the majority of styles. When this is cut two inches or shorter there will only be light movement remaining.

Tight wave (19mm)
3/4 inch rod size will open to approximately 1-1/2 inch wave. Remember, if this is cut shorter than two inches most of the curl is cut out. This can also be wave or curl depending on the direction it dries. Wet it and scrunch into curl or comb flatter into a wave.

Loose curl (15mm)
5/8 inch rod size will open to approximately 1-1/4 inch curl. Remember, if this is cut shorter than two inches most of the curl is cut out. This can also be wave or curl depending on the direction it dries. Wet it and scrunch into curl or comb flatter into a wave.

Tight curl (10mm)
3/8 inch rod size is curly and will open to 3/4 inch curl, approximately the size of your thumb. This can be wave or curl depending on the way it dries. Wet it and scrunch into a curl or comb flatter into a wave.

Medium Afro (4mm)
3/16 inch rod size is a slightly looser afro kink-curl. This curl is also true to rod size