Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Pretty good little kit, has more items then some kits twice as expensive . Only gripe I have is that some of the metal isn't polished and feels quite rough , that being said it's no big deal and probably gives a better grip if your fingers slip. Give them a go, can't complain at the price.