[2][3] The sport's name is derived from the intentionally convex or uneven nature of the bowling green which is traditionally formed with a raised centre known as the crown.
Crown green bowls is played in the Midlands, Northern England, and North Wales.
The aim of an end is for a player to finish with their own bowls closer to the jack than those of the opponent.
Competitive games are usually held between two people with the winner being the first person to accumulate 21 points.
The surfaces also often feature ridges, hollows and slopes to make the game more difficult.
Crown green bowls come in a variety of bias strengths, weights, densities, sizes, materials and colours.
Wooden bowls have a variable density throughout their core due to the nature of wood.
There are written specifications determining the size, weight and bias strength of jacks.
[8] To be able to be used in an official British Crown Green Bowls Association recognised league match or competition, jacks must be black, white or yellow.
Jacks measure 9.5 cm (3 & 3/4 inches) in diameter and weigh about 660 grams (1 lb 7 oz).
When delivering a jack or bowl, the player must place their non-leading foot on the mat.
The Waterloo Hotel had its safety licence to hold big competitions withdrawn and the compitition lost some of its stature when it transferred to Fleetwood Bowling Club in 2022.