Golf club head with center of gravity adjustability

A golf club head comprising:

• a first piece comprising a face, a first crown portion, a first sole portion, and a hosel;
• a second piece affixed to the first piece, the second piece comprising a second crown portion with a cover, a second sole portion, and a rear portion;
• a hollow tube having an upper opening and a lower opening;
• and
• a cap,
• wherein the hollow tube is inserted in both the first piece and the second piece and is spaced from the hosel,
• wherein the hollow tube is composed of a composite material,
• wherein each of the first piece and the second piece is composed of a metal material,
• wherein the cover of the second crown portion closes the entire upper opening of the hollow tube, and
• wherein the cap closes the lower opening of the hollow tube and is removably affixed to a sole of the golf club head.