Pull out all the stops with Easton's 4MM Match Grade Full Metal Jacket. 4MM FMJ Match Grade is an ultra-micro diameter shaft that offers less wind drift and minimizes friction to provides the industry's best penetration. Precision-made in Easton's USA factory, FMJ features a lightweight, strong carbon backbone with the added KE and accuracy of a precision -drawn aluminum jacket. 4MM Full Metal Jacket is offered in four spines sizes from 400 to 250 to cover virtually all bowhunting setups. 4mm Match Grade Aluminum 8-32 point half-outs (55 grains) come standard. Compatible with Easton's full lineup of 4MM Match Grade Halfouts (3 additional weight/material variations).