I noticed some of your Ball Markers, like the RBM and Mega Marker are quite large. Do the rules of golf specify what type and size of object are acceptable to use as ball marker on the putting green? Do the rules prohibit the use of any particular objects as ball markers on the green?
The rules (Rule 20-1) only state that the marker should be (as opposed to must be) marked using a "ball-marker, a small coin or other similar object. The USGA and R&A consider it “appropriate” for players to use a small, round, relatively flat object - whether this is a coin, or something specifically manufactured for use as a [...]