The Letter Kuf is made up of two separate letters.There is a Chof Kefufa which is written within the lines, and then a part that is longer than a Zayin, but not as long as a Nun Peshuta,which is angled next to the Chof Kefufa.The Letter Kuf, therefore, is a large letter, and one must make sure that there is enough space below it, in order to have ample room for Zayin part of the Kuf. The Kuf's dimensions are 5 kulmusim in height, (that is, 3 kulmusim for the Chof Kefufa, and 4 kulmusim for the Zayin) and 3 kulmusim in width.(That is- 3 kulmusim for the Chof Kefufa, and the Zayin section is neatly placed and angled slightly under the roof of the Chof Kefufa section.) The top and bottom corners of the body of the Chof Kefufa should be rounded, and the space in the middle of the Chof Kefufa should be 1 kulmus.(Exactly like the rules given above for a Chof Kefufa.) We do not to complete the bottom section of the Chof Kefufa part of the Kuf, rather we stop about 1/4 to 1/2 of the way from the beginning. As long as there is a clear bottom section to the Kuf, it will be valid. There should be one Tag at the left end of the roof. (This Tag should not be on the very end of the left side, nor be made too large, because it can be a problem of possibly looking like a Lamed.) The two parts of the Kuf should not touch each other at all.If they do touch, even with an amount as thin as a hair, it would be invalid.