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hifax is the material that covers the suspension rails on the bottom. The track clips glide across it. It is also called sliders. It is a wear item, usually at the front; some sleds are more prone to wear of hyfax than others. If you wear it too thin, you end up having to replace the rails. Hyfax is about 15-40 bucks, depending on type; rails are a LOT more expensive.
Good advice to replace before it needs it...
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2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/av-reports/index.html
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