The Halo — 360° Golf Ball Line Marker

One pass. One line. All the way around. The Halo is the only golf ball line marker with a stencil edge on both sides of the line — so you get one clean, unbroken circle around the ball instead of a wobbly freehand mark or a quarter-turn stencil you have to line up by eye. How it works Open — split the two halves and set your ball inside. Snap — six magnets pull it shut and pull the ball to center. The seat is cut as a true sphere, so the ball lands on its own equator. Trace — run your pen once around the slot and lift it off. Ten seconds, start to finish. Why the line comes out clean Three magnets per half sit 0.35mm proud of the plastic around them. The magnet faces meet before anything else does, so the marking slot is exactly 2.30mm every time — whether you snap it together gently or slam it shut. The bosses never touch, and your hand pressure never enters the equation. Both walls of that slot are stencil edges, so the pen tip has nowhere to wander. Specs Two-piece magnetic clamshell, identical mirrored halves Six neodymium magnets, 8mm × 2.75mm — three per half at 120° 2.30mm marking slot — fits standard and fine-point marking pens Fits every standard golf ball Black, carbon-fiber texture One dual-tip marking pen included (fine + ultra-fine) Patent Pending No batteries, no moving parts, nothing to break. Toss it in your bag and it'll be there next season, still snapping shut the same way. Mark once. Aim every time. Is a line on your golf ball legal? Yes. The Rules of Golf put no limit on markings you add yourself. The R&A's equipment interpretation for Rule 4.2a(2) says it plainly: "There are no regulations to limit what or how many markings can be applied to the ball by the player, provided its original markings can be discerned." Felt-tip pen markings are named specifically as conforming. Rule 6.3a goes further and encourages it — "The player should put an identifying mark on the ball to be played." The PGA Tour plays under the same USGA and R&A Rules, so there's no separate tour restriction. Callaway, Titleist and TaylorMade all sell conforming balls with alignment lines printed on them. Three things worth knowing: Draw a line, don't coat the ball. Rule 4.2a(2) prohibits deliberately changing how a ball performs. A pen line is explicitly fine — coating or dipping a ball is not. That's why the Halo ships with a fine-point pen. Leave the brand and number readable. The one condition is that the ball's original markings can still be made out. A line around the equator is nowhere near that limit; coloring in a whole ball would be. Mark the ball, then pocket the tool. Rule 10.2b(3) prohibits setting an object down to help you line up a shot. That's about the tool, not the mark — mark your ball and put the Halo away.