Salt Plus Pro 48 cranks have curved trapeze shaped crank arms and are made of heat-treated seamless chromoly.Features-Tubular chromoly arms (heat-treated), chromoly spindle-Curved trapeze shaped crank arms-Heat-treated seamless chromoly-Left & right side sprocket bolt boss -Includes bottom bracketItem Specifications-BB Included:Yes-BB Style:Mid-Color:Black-Defined Color:Black-Crank Length (mm):165-Crankset Style:3-Piece-Bore:19-Spindle Material:Steel-Crank Arm Material:Steel-Drive Side Compatibility:Right and Left Hand Drive