Six spools of shimmering thread coordinate perfectly with MJ Kinman's December Tanzanite Fat Quarter Set eQuilter product code FAFQBTAN to complete the Birthstone Series pattern eQuilter product code MJPATTNZ. 'MJ Kinman Birthstone Series - December Tanzanite' Thread Set, includes six 250 yard spools of 40 wt Sulky Rayon Thread.