I have put piano key borders on alot of my quilts and it just varies as to what size I use. I have a picture of one on this QB and I used white and gold I think. But I have also used alot of the fabrics I have left over from making the quilt. I think my keys were 1 1/2" width by 3 1/2" length. Love the piano key border and it uses up alot of fabrics.