Approximately 50-60m per ball (with some variation). 16 balls (totaling approximately 165g). Fine thread, thick thread. Includes threads from dyeing atelier kazu and others. It seems one ball is enough to embroider about one tea towel with a simple design. This is based on information from when I purchased them; I have not measured the length, so please refrain from returns due to discrepancies. I am selling them because I cannot use them all. I purchased them for 500-600 yen per ball. I am offering them at a lower price as a set. They were stored in a Ziploc bag in a storage case. Please refrain from purchasing if you are sensitive about such details. No pets. To prevent replacement, please refrain from returns or refunds.