Always start with the lowest load level and increase to the next level if the pin doesn't seat properly., Load Level Options (#3-C22CW Brown Load, #4-C32CW Green Load, #5- C42CW Yellow Load). Load Levels range from lowest to highest, Ramset Powder Loads help create a powerful charge that penetrates pins through hollow block and concrete., Compatible with most P.A.T brands, 100 Loads Per Box