ski: advantage: 1. High quality steel sled 2. Adjustable,folding steel Sled 3. Easy taking 4. customised model Ski: ... skiing, ski for kid, snow scooter, high quality steel sled, adjustable, folding steel SledAdvantage:1. Front and rear ski: strenthened HDPE ... ski board2. Ski board thickness: 4-15mm3. Steel pipe thickness ...