For models R352 R758 (maybe more). this is for two Hornby Triang S5944 these are 3d printed. these replace the magnets.
HORNBY TRIANG S5447 TRACTION REPLACEMENT R357 R751 CLASS 31 CLASS 37
Hornby Triang S5447 Traction Magnet x 10 - Remagnetised - R357 R751 (#526)