Dan Paley was fed up of breaking plastic bar ends but didn't want the hassle of screw in ones. That's when he came up with the idea of the M-Cap, a push in bar end with a metal surround. The part that hits the ground is metal as is the part between the bars and bar end. The best of both worlds.
A new dual material bar end from BSD, Similar to the BSD M-Cap it features a push on outer ring, the ring is made from a hard nylon the same used on BSD hubguards. It makes for a long lasting plastic barend.