We have used our Splice! Hybrid rope for the bumper which has Good UV resistance and is relatively soft rope helpning to absorb the impact and reduce scratches or marks caused when the rope and stopper swings against the boat. This is an upgraded solution to traditional rope stoppers specially to solve three problems which we had observed with traditional stoppers. First, it has an end cap which prevents the stopper from riding forward on the rope. Our stopper will always be at the end of the rope where they should be. Second, it has a rope "bumper" spliced around the stopper. This really helps to "soften the blow" when the stoppers hit the hull, cockpit,... or people! We have used our Splice! PU12 Hybrid rope for the bumper which has good UV resistance and is a relatively soft rope helping to absorb the impact and reduce scratches or marks caused when the rope and stopper swings against the boat. Third, it has a flattish upper surface to help give you more grip and pulling power than round stoppers which are more likely to slip through your fingers. Features: Cap to prevent the stopper riding forward on the rope Rope Bumper to soften impacts Flat upper surface for better grip and pulling power Bumper constructed with Splice PU12 Hybrid Rope Cap made in ASA for good heat and UV resistance 2x pcs in a pack Rope Bumper available in colors: Black/Gray Black/Blue Black/Green Black/ We can do customization based on your color preference of both the cap itself and the bumper rope. for customize available Color, (Grey, Blue, Red). Available in four sizes for the following ropes: 3mm - 4mm 5mm - 6mm 7mm - 8mm 9mm - 10mm (This size only has a double bumper rope) Size/Variation Chart 3mm to 4mm 0.005kg 5mm to 6mm 0.008kg 7mm to 8mm 0.009kg 9mm to 10mm 0.024kg