• OBD Rubber Rings come in a pack of 20
• PVC cover for your rubber band constrictor ties
• Provides a professional finishing touch to your DIY speargun rubbers
• Covers unslightly knots and line ends for a smooth finish
• Protects against UV degradation of ties
• Slide onto rubber prior to tying, then slide over ties
• Shrink to a tight fit with a heat gun (or hair dryer)
• Blue rings fit rubber of diameters approximately 13mm to 16mm

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