The Power FTDK Color ABS Custom Knob is specifically designed for Newell 300 400 500 600 Series fishing reels, making it a perfect fit for both freshwater and saltwater fishing. Made of durable ABS material, this 50mm long knob is lightweight at 0.7 oz and designed for trolling reels. The FTDK CUSTOM brand ensures quality, and its unique design adds a touch of style to your fishing experience. Ideal for freshwater fishing and saltwater fishing, this custom knob is a must-have for anglers looking to enhance their gear.