These rubber gimbals have been designed for comfort and performance. Excellent for your Vertical Jigging rods, with no sharp edges and utilizing a softer rubber material you can put these on rods that you would not normally put a gimbal on. Excellent for counter balance as the 16 mm weighs 1-1/4 oz. and the 23 mm weighs in at 1 oz. Sizing Chart MODEL Length ID OD Weight CRBRG-16 1.80" (45.7mm) 0.630" (16mm) 1.00" (25.4mm) 1.25 oz (35.4g) CRBRG-23 1.80" (45.7mm) .910" (23mm) 1.00" (25.4mm) 1.00 oz (28.3g)