26 Gretschadelphia 7 months ago I'm not a flatwound guy. I prefer roundwound pure nickels on all my single coil guitars, especially the X175B w/ the Franz pu's. 11's would probably provide optimal tone but I use 10-46's because they work better with the my small old arthritic hands. Never tried Pyramids but I've been very satisfied with Curt Mangan Pure Nickels, GHS Burnished Pure Nickels and Ernie Ball Pure Nickels. The Mangans are available in both round or hex cores and sound great when new while the GHS and Balls seem to maintain brightness longer.