1. An air filled leather sphere with a circumference of 68-70cm (27"-28") and a dry weight of 410-450 gms (14-16 ozs) which is inflated to a pressure of 60-110 kPa (8.5-15.6 psi). Football (soccer ball) Softball Gaelic Football Water Polo ball

2. This spherical ball is made from a cork core, layered with tightly wound string which is encased in a leather case with a raised seam around the equator. It must weigh between 155.9-163 gms (5.5-5.75 ozs). Its circumference must be 224-229 mm (8 13/16"-9") in circumference. Cricket ball Handball Field Hockey ball Croquet ball

3. This spherical ball has been made in an assortment of ways over the centuries but is most commonly constructed of a liquid filled core, wound with layers of thin rubber thread and coated in a plastic or synthetic dimpled membrane. It may not weigh more than 45.93 gms (1.62 oz) and its diameter not less than 42.67 mm (1.68"). Squash ball Golf ball Rugby Union ball Snooker ball

4. This spherical ball is a gas filled celluloid ball with a diameter of 40 mm, a weight of 2.7 gms and a co-efficient of restitution of 0.4. Invariably white, ths ball has a matte finish. Squash ball Tennis ball Table Tennis ball Boule

5. This spherical ball is constructed of two half shells of formed rubber joined by an adhesive and covered in a cloth. If the cloth is seamed, then it must be stitchless. Its dry weight shall be 56-59.4 gms (1.975-2.095 ozs). The diameter must be 6.541-6.858 cms (2.575"-2.7"). Volleyball Tennis ball Softball ball Baseball

6. This prolate spheroid ball is slightly pointed at each end. It is made with four leather panels, stamped with a pebble-grain texture. Two panels are laced together and the whole encases a polyurethane or rubber bladder. The ball is 28 cm (11") long and at its widest point is 56 cm (22") in circumference. It must weigh 397-425 gms (14-15 ozs). American Football Netball Hurling ball Gaelic Football

7. This ball is made of a solid high compact plastic, although in days gone by it has been made of bamboo or willow root. It is 3"-3.5" in diameter and weighs 4.25-4.75 ozs. Pool ball Polo ball Ten Pin Bowling ball Lacrosse ball

8. These balls are made with two hemi-spheres of rubber compound, glued together to form a hollow sphere and which is then buffed to a matte finish. Different balls are manufactured to accommodate different temperature and atmospheric conditions and standards of play. The ball types are denoted by coloured dots. Table Tennis ball Water Polo ball Petanque ball Squash balls

9. This spherical ball is made of a cork or rubber core (or a mixture of the two). The core is layered with twine, yarn or sometimes wool. It has a two piece leather cover which is stitched togther using 108 stitches of rolled waxed cotton thread. It is 22.9-23.5 cm (9"-9.25") in circumference and weighs 142 gms (5ozs). Croquet ball Shinty ball Baseball Quidditch ball

10. This spherical ball is constructed of a solid rubber in either white or orange colours. Its circumference must be 19.69 - 20.32 cm (7.75" - 8"). It must weigh between 5 and 5.25 ounces. When dropped from a height of 72" onto a solid wood floor it must bounce up 49". Lacrosse ball Basketball Crown Green Bowls ball Cricket ball