ID:4.2mm/6.2mm/8.0mm/9.8mm/7.62mm
Spine: 300/350/400/500/600/700/800/900/1000/1100/1300 (you can choose anyone, let me know)
Length:27-33inches
Straightness:+/-0.001, 0.003, 0.006
Note: weight tolerance is 0.5grains per dozen, 12pcs is one group as our weight controlling.