A golf ball having a North pole and a South pole, an equator and a primary meridian, the equator and primary meridian divide the ball into North, South, East and West hemispheres, and Northeast, Northwest, Southeast and Southwest quadrants. A grid pattern projected on the ball surface divides the ball laterally and longitudinally into a number of overlapping zones. The dimples within the zones have average depths hex, hsx, hpx, hei, hsi and hpi and selected values of e, s and p which are the difference between the minimum and maximum values of the relative ratios of the dimple depths, hex.sub.r/hei.sub.r, hsx.sub.r/hsi.sub.r and hpx.sub.r/hpi.sub.r determined when the ball is rotated by a value of from 0 to 360 about its polar axis.

Thermoplastic and thermoset compositions including hydroxyurethane linkages, golf ball components formed using such thermoplastic or thermoset compositions, and golf balls including such golf components.

Golf balls including one or more layers having at least one radar detectable mark disposed on the surface thereof are provided.

Casing compositions including carboxyl groups, cover compositions including nucleophile groups and an adhesion promoter capable of crosslinking carboxyl and nucleophile groups, and golf balls made from such compositions that have crosslinks between carboxyl groups in the casing composition and nucleophile groups in the cover composition. The nucleophile groups may be hydroxyl groups, amino groups, or other types of nucleophile groups. The adhesion promoter may be a polyaziridine. An acid catalyst may be used to facilitate the reaction between the nucleophile groups in the cover composition and the adhesion promoter. The type and concentration of the components in the casing and cover compositions, including the adhesion promoter, affect the adhesion between golf balls having components made from such compositions and, thus, can be used to produce a golf ball having increased durability.

Casing compositions including carboxyl groups, cover compositions including nucleophile groups and an adhesion promoter capable of crosslinking carboxyl and nucleophile groups, and golf balls made from such compositions that have crosslinks between carboxyl groups in the casing composition and nucleophile groups in the cover composition. The nucleophile groups may be hydroxyl groups, amino groups, or other types of nucleophile groups. The adhesion promoter may be a polyaziridine. An acid catalyst may be used to facilitate the reaction between the nucleophile groups in the cover composition and the adhesion promoter. The type and concentration of the components in the casing and cover compositions, including the adhesion promoter, affect the adhesion between golf balls having components made from such compositions and, thus, can be used to produce a golf ball having increased durability.