Description: Made of high grade PVC; Environmental-friendly, strong, lightweight and durable Curved line with spiral pattern to add strength and good water catching capability aluminum tube ranging from 27.3mm to 28mm Easy install: just screw the Great kayak accessories for you Specification: Size (): Approx.13.9x3.7cm/5.5x1.5inch Inner Diameter: 29.9mm Outer Diameter: 30.1mm Tube Thickness: 3.4mm Thickness: 2.3mm Package Includes: 1 Piece Paddle Note: Please allow slightly difference due to manual measurement. Thanks