Apr 22, 2022 · Mason Plastics . ico-map. Winchester, TN Manufacturer*, Custom Manufacturer $1 - 4.9 Mil 1962 10-49. Manufacturer of UHMW extruded plastics including extrusions in 10 ft., 20 ft. & 100 ft. sizes. Types include full & half round, bar clip, J-leg, C-rail ver, flat C-rail ver, guide rail snap-on & bar cap extrusions. Made in USA. Call.