Grooves of golf club heads and methods to manufacture grooves of golf club heads

A putter type golf club head comprising:

• a putter face defined by a toe end, a heel end, a top rail and a sole, the putter type club face comprising a plurality of first curved grooves and a plurality of second curved grooves, each of the first curved grooves and the second curved grooves, and a plurality of land portions between the first curved grooves and the second curved grooves;
• wherein:
• the plurality of first curved grooves are parallel to each other;
• the plurality of second curved grooves are parallel to each other;
• the plurality of first curved grooves intersect the plurality of second curved grooves at a plurality of points along the plurality of second curved grooves;
• a width of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end;
• a width of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end;
• a depth of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end;
• and
• a depth of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end;
• and
• the putter golf type club head has a loft angle less than 7 degrees.

A putter type golf club head comprising:

• a putter face defined by a toe end, a heel end, a top rail and a sole, the putter type club face comprising a plurality of first curved grooves and a plurality of second curved grooves, each of the first curved grooves and the second curved grooves, and a plurality of land portions between the first curved grooves and the second curved grooves;
• wherein:
• the plurality of first curved grooves are parallel to each other;
• the plurality of second curved grooves are parallel to each other;
• the plurality of first curved grooves intersect the plurality of second curved grooves at a plurality of points along the plurality of second curved grooves;
• a width of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end;
• a width of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end;
• a width of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end;
• and
• the putter face comprises a face insert and the plurality of first curved grooves and the plurality of second curved grooves are disposed on the face insert;
• and
• the putter golf type club head has a loft angle less than 7 degrees.