DC300 Straight from the horse's mouth(Rob Kent)............
It is the big brother of the QUICKSILVER series at 68-71/gram-weight, 3.0 torque, and a high bend-point. It is only offered in S or X. It is for better players at the higher end of a swing speed (ie- 95-105/mph for Stiff-flex). Specs are most similar to MATRIX's prior REGIN BLACK series, which were $400+ shafts. It is a very nice shaft, but it is too much shaft for guys like me in the lower-end of Stiff being 71 years old and topping out at 95mph.