More heavy-duty then their un-xtreme bretheren, MaxTrax's Xtreme recovery boards have replaceable aluminum teeth, and extra support for heavier vehicles. Product Features: MAXTRAX XTREME is also easily repairable in the field. If a tooth gets damaged, simply flip the board over and use a T-50 Torx bit to remove and replace the damaged tooth. MAXTRAX XTREME uses a proprietary and patent-pending thread & bliplock system to ensure secure physical engagement of a new tooth with its recess after replacement. MAXTRAX XTREME will nest with MAXTRAX MKII recovery tracks, (although there is a slightly larger space between the tracks due to the design of the underside of the MAXTRAX XTREME). Australian designed, engineered and manufactured 88 replaceable anodised alloy teeth; designed for XTREME users Safe and easy recovery from sand, mud, snow and slush Made from super-tough engineering-grade reinforced Nylon Compatible with MAXTRAX MKII and MAXTRAX Mini Proven, patent-pending, multi-award-winning design Weight: 9kg/20lbs per pair Six glove-friendly handles A variety of mounting and carrying options are available Product Specifications: External Dimensions: Height 4 inch / Length 47 inch / Width 14 inch Product Weight: 20.3 lb Warranty: Lifetime Country of Origin: Australia