Since coming into the UK market last year, Puma is at the heart of innovation & design in cricket. This year, they have introduced the carbon core technology handle to their cricket bats. This dramatically reduces the handle weight whilst increasing its tensile strength for greater power. Willow Grading: There are 5 grades of wood, 6000, 5000, 4000, 3000, 2000. Starting with the top class 6000 grade 1 willow, which has individually selected clefts, even & straight grains & is blemish free. The grading then goes all the way down to the Club quality 2000 grade 4 willow which has some staining & pin marks.