Quoits used to be very popular in pubs around here (Welsh Borders), in fact it's the only pub game I'm good at! Unfortunately it has died out. The indoor version was played with rubber rings about 4'' od, 2.5''id thrown at a horizontal board with two dishes and a peg in the middle. The outdoor game was similar to Horseshoes and was played in a sand pit with quoits about 6'' od, 4.5''id. Both types of ring were made from relatively flat material and were usually dished, The dome had to land upwards to score.