Classic Rope Company Coretech™  Core 35' Heel Rope 3/8" True Sizes: MS, M 5-Strand SPYDRHL The Spydr5 is the next generation of Coretech™ technology from Classic Rope. Spydr packs more material in a smaller diameter for a feel like nothing else. With five strands of twisted nylon ingeniously engineered around an oversized core, the Spydr delivers the perfect balance of snap and tip weight to make it the ultimate trap for your prey.