Pls keep away with children as these are sharp punches Material: manganese steel Calvanic plating punches,very sharp,but not quite nice and bright,quite useful tool Easy to make smooth corner end on handbags,wallets,cases,bags,straps,purses,belt,collars etc These are useful punches for leather craftmen,use these to cut leather corner,making wallet strap and belt half-shaped end Sharp enough for most leather project.if you still feel not sharp,pls sharpen your punches before use. Package include: 5 pcs DGOL arc-shaped punches with size: 10mm,15mm,20mm,30mm,40mm