be hollow shown or solid the extender portion 320 of the riser barrier is curved downward between the proximal end 332 and the distal end 340 and holds the elongated bar 112 away horizontally from the riser portion 310 by dimension u201c k u201d and vertically away by dimension u201c p u201d where in one embodiment dimension u201c k u201d is about 1 u00bd inches and dimension u201c p u201d is about 1 u00bd inches the horizontal separation between the riser portion 310 and bar 112 permits the user to slide his her hand along the bar 112 without interference the downward curve of the extender portion 320 giving added room for the user 39 s hand the length of the riser portion 310 deters the skateboarder from sliding on the rail as shown in the figures the riser portion 310 has a thickness given by dimension u201c j u201d which in one version is about u00bd inch and a width given by dimension u201c n u201d which in one version is about 1 inch the proximal end 332 of the extender portion 320 is generally flat to conform and attach to the bottom of the bar 112 the distal end 340 of the extender portion 320 includes a generally flat rectangular vertical portion the flat rectangular vertical portion fastens to the riser portion 310 and being wider than the riser portion 310 has a dimension of u201c m u201d by which it overlaps on either side the riser portion 310 in one.