Marks in the shape of a triangle approximately 15 feet from the foul line to assist the bowler in consistently targeting a spot closer than the pins. There are seven arrows, one every five boards. From the right channel, the 1st arrow is on board five, the 2nd arrow on board ten, the 3rd arrow on board fifteen, the 4th arrow on board twenty, the 5th arrow on board twenty-five, the 6th arrow on board thirty, and the 7th arrow on board thirty-five. If the bowler is left-handed, reverse the order of the arrows from the left channel.