Colony squareback bmx stem rainbow finishthe colony squareback stem is cnc machined from 7075 t6 aluminum for maximum strength featuring a topload design with extensive internal and external machining to help save weight machined colony logo on the faceplate chamfered edges solid chromoly stem bolts and a recessed compression bolt area for a flush fitting top cap features full cnc machined from 7075t6 alloy stronger lighter than 6061t6 stems higher top load 6 bolt system 50mm reach 33mm