The paddle grip works as an adapter for kayak paddles and gives the paddle shaft an oval shape. This will help you feel when the blade is in the correct position for a correct catch. The Carbon Paddle Grip is recommended if you want to improve the catch, eg when you feel that you are splashing too much water. Ideally, the insert is almost completely silent - on both sides. The finger indicator on the grip also helps you to get a more constant grip position, ie that the hand does not move inwards or outwards. You can have the indicator either between your index finger and middle finger or have it outside your index finger.
Assembly: You either tape the grip with electrical tape directly on the paddle or put it under grip tape, eg: