Valdani Pearl Cotton Ball Size 12 109yd 6 Colors Berties Year Collection. Perle Cotton Size 12. Bertie's Year by All Through The Night. Beautiful Valdani threads are hand dyed by highly skilled artisans in customized designer colors. This overdyed thread is a highly decorative, double twisted, indivisible long staple 100% cotton thread that has been double-dyed to achieve an amazing depth and profusion to colors. These threads are great for sewing, embroidery and applique. Bertie's Year Collection, contains 6 balls. Size 12. Excellent for Wool Applique, Stitching, Punch Needle, Hand Quilting, Hardanger. CHK-BYPC12SMPLR