dimension u201c e u201d is sufficient to deter sliding on the cylinder the embodiment 300 in fig5 a and 5b includes an elongated cylinder 110 and a riser barrier having extender portion 320 and riser portion 310 the extender portion 320 is curved downward between the proximal end 330 and the distal end 340 and holds the elongated cylinder 110 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 cylinder 110 permits the user to slide his her hand along the cylinder 110 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 330 of the extender portion 320 is generally arc shaped to conform and attach to the curvature of the elongated cylinder 110 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.