BB-DB-R4 BB-DB-R6
Full length:125mm(4.9in) 180mm(7in)
Effective lenth:101mm(4in) 155mm(6.1in)
Weight:64g(2.6oz)[air] 74g(2.6oz)[air]
BB-DB-R8 BB-DB-R12
Full length:230mm(9in) 325mm(12.8in)
Effective length:208mm(8.2in) 300mm(11.8in)
Weight:88g(3.1oz)[air] 116g(4.1oz)[air]