Oh my, oh my! Each zip lock bag is individually labelled, making it very easy to find the right resistor. They do include a chart but you don't need it because of said labelling. Everything in the box looks high quality, it appears a lot of care was taken to put together a great product. As for the resistors themselves, they work just fine, my testing did not indicate any issues. I would highly recommend this for any Arduino/RasPi makers who want to save time reading the resistor value charts.