The F-69-HP has a hollow point for nesting a 0.68 caliber paintball so you can leave a mark. Interestingly enough, JCS tests show the HP rocket travels about the same distance as the solid nose. The shape of the F-69 hits your target softer than other rockets by distributing the impact over a wider area using a softer foam. No hard plastic pin or tube, only soft foam! Slight fin angle creates the perfect spin to ensure a precise flight path. An engineered rocket specifically designed for MKX launchers. JCS soft durable foam will outlast, out-fly, and out-perform all others! Two inches in diameter ready to hold a paintball. Patent Pending