Yes C-Groove Olivia Putter. New for 2007, the C-Groove Olivia incorporates variable weighting allowing three choices of head weight as you encounter varying green speeds and surfaces. With the standard brass inserts ( already installed), the head weight is 355 grams; with the lighter aluminium inserts the head weight is 340 grams; with the heavier tungsten inserts the head weight is 370 grams. Unless otherwise stated, the Yes Olivia C-Groove Putter comes with special tool and weights to enable you to change the weight of your putter easily.