This is the new rimless radial coned end cap R.R.C.E. This new rimless design will allow for error in stack up configuration. The rimless design will seat internally instead of the face of the tube. You can easily achieve a solid lock up without spending time correcting the length of spacers to get that perfect fit.
The 1.500 TI end cap weighs about .9 oz
The 1.500 AL end cap weighs about .4 oz
Gr5 TI / 7075 Al