RE: what is better>>>>>>>>>>
That is the variances of shafts. Depending on what variance you are talking aboput it could mean one of two things.
#1 is the advertised variance in straightness of a specific grade of shafts. Most shafts are broken down into three grades of shafts. Premium shafts usually have a variance of no more than +-.001 (1 thousandth) inches. This means that the shaft can vary no more than one thousandth of an inch in any one direction. Medium grade shafts are usually +-.003" (3 thousandths) and low grade shafts are generally +-.006" (6 thousandths).
Keep in mind that this number only represents total variance in one direction from the center line. So a .006 shaft can vary as much as .012 inch total. .006 in one direction and .006 in the opposite direction.
Just a note...... the correct way to type it is to have a decimal point and three places after that decimal point. .002 This gets you to the thousandths place rather than the tenths or hundredths place.
#2 is the weight varinace within a dozen shafts that you buy. This is advertised in grains. Most premium shafts will vary no more than one grain within a dozen shafts. Medium grade shafts will vary no more than 2 o 3 grains within a dozen and low grade shafts usually do not have a weight guarantee at all.