What it is
Boilies are a carp bait: shelf-life or freezer, 10–18mm on most UK pits, sometimes smaller on commercials that allow them. They are a single-bait, long-stay approach more than a catapult rhythm.
On a day-ticket F1 lake a 18mm boilie is often the wrong conversation. On a pit, a balanced 12mm with a bag of pellets or a stringer is still how a lot of carp get caught. Check bait bans.