House of Forged BLACK DIAMOND Long Drive Shaft this is a newer version of our prior, very popular HD PROTOTYPE long-drive shaft series, which were used to win more LDA Long-Drive Tour Events than any other long-drive shaft in history. These shafts feature MATRIX? ?D?technology and they are offered in X/XX/XXX/XXXX-flexes. They run from 72-79/gram-weight with a high bend-point, 2.5 torque and a medium tip section. Products Code:HOF0038 Products Name:House of Forged BLACK DIAMOND Long Drive Shaft.