TSK Authentic Parts: Full walnut grip for Zoli shotguns. Completely made in Italy with precision CNC machining. This item is the version installed in the Trap and Sporting Full stock versions (While the Skeet uses the Superlight) A different grip size may be need for example during the growth of young shooters or to use the stock on two different shotguns (interchanging the back of the stock) Size chart: Size XS: for hand palm's width smaller than 8cm (smaller than 3.1 in) Size S: for hand palm's width between 8 and 9cm (between 3.1 and 3.5 in) Size M: for hand palm's width between 9 and 10cm (between 3.5 and 3.9 in) Size L: for hand palm's width between 10 and 11cm (between 3.9 and 4.3 in) Size XL: for hand palm's width larger than 11cm.