・ We've published instructions for the "Double Lark's Head Knot," which boasts three advantages: "No wishbone needed! Easy! Adjustable length!" First, find your preferred length using a "Lark's Head Knot," and once you've decided on the length, we recommend using the "Double Lark's Head Knot." ・ Since it's 6mm hollow, you can pass a Dyneema line through it for a bungee cord specification. #anzyproduct's Rubber List ↑ This is a list of the rubber products we sell. ＜Specifications＞ ・ Outer diameter 11mm x Inner diameter 6mm ・ Maximum elongation rate: 8 times ・ Made of 100% natural rubber, emphasizing stretch ・ Stored in a vacuum, oxygen-removed, light-shielded, and cool, dark place until shipment ＜Reference＞ Initially, select a slightly longer rubber and shorten it to find your preference. If the rubber is stiff, make the rubber slightly longer with a Lark's Head Knot. It will feel softer if you make it longer. If you want more power, adjust the rubber shorter with a Lark's Head Knot to get the maximum power from the rubber. Our rubber has ample strength even when fired at full power. The guideline is that the rubber should be about 70-90% of your arm strength when pulled from the middle of the spear gun's total length to slightly forward.