Steel, chromed, replica aftermarket.
Kickstarter with fine spline for 16mm shafts, see picture, manufacturer fitment:
KE125 80-83 1(3064-1027)
KDX175 80-82 (13064-5005)
KE175 80-83 (13064-1027)
KDX250 80 (13064-5005)
KDX250 81-82 (13064-1033)
KDX250 83 (13064-1103)
KL250 78-79 (13064-1020)
KL250 80-83 (13064-1027)
KLX250 79-80 (13064-1027)
KX250 80-81 (13064-5005)
KX250 82 (13064-1033)
KX250 83 (13064-1038)
KX250 84-86 (13064-1105)