Our White Gloss (GW) has a facestock weight of 57# ± 10% and a liner weight of 50# ± 10%. In terms of thickness, the face sheet is 4.1 mil ± 10% and the liner measures at 2.8 mil ± 10%. Our inkjet roll products were specifically designed for use in Primera brand printers. However, it appears that our RL2942GW does meet the specifications for Epson's ColorWorks CW-C6000 model. We’ll be happy to troubleshoot the issue with you, but need some additional information. Please submit a support ticket at the link below and one of our Customer Support Representatives will reach out to assist you in resolving the issue. https://secure.onlinelabels.com/Support/SupportRequest.aspx