Knifes quantity:form 3 pieces - 24 pieces.How to choose the number of knives:1:)Decide how many centimeters of bamboo width you need (2 cm)2:)measure the diameter of your largest bamboo, such as 8 cm in diameter3:)Calculate the number of required toolsNote:As the above data,For example: 8×3.14÷2=12(You need the number of knives) Model3 knivesWeight2kg