Viper / Narwhal  Spare Rock Tip. Replacement rock tip and screw set for the Viper Greenland Paddle and the Narwhal Greenland Paddle . High-impact tip insert shields the paddle tip from splitting and cracking during beach launches, rocky shore landings, and portages. Available in 25 mm standard length and 50 mm extended protection length for high-use expedition paddlers. Colour options in black and sand/mint green to match paddle finish. Straightforward screw-in replacement — no specialist tools required.