---Pair of glow in the dark rubber ferrules ---Once exposed to light these will glow green, making the walking stick easier to locate during the night ---To fit tubing diameter of 19mm (3/4") - please see photo above showing how to measure ---Ideal replacements for "Glow & Go" walking sticks by Drive Medical models RTL10304TD, RTL10304CR and others ---Reinforced with metal washer 100% Satisfaction Guarantee - we want you to be happy with your purchase so if you do have any problems please send us a message and we will do our best to sort it out. Should you feel that you need to leave negative or neutral feedback please give us the opportunity to rectify the situation first.