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Amount of grooves and twists. there were six grooves and were a compatible width so the -- we call those class characteristics because it is possible for other guns to have six grooves with a twist of a similar width. it does help narrow it down. for instance if these had five grooves and my gun had six grooves then i could automatically eliminate it. the class characteristics of the bullets and jacket match. however, i was not able to, again, i could not identify it as being fired in that gun or eliminate it as being fired in that gun. >> let me ask you to assume the following fact for the pu...

Identification. we take a look at them and look at what kind of marks are there and see if we can find things. it varies from gun to gun. >> let me begin by showing you state exhibit 186 and asking you to refer to your report and tell me, is this one of the items which would be submission 1, item 2 that you reviewed for your purposes? >> yes, it is. >> and in looking at that one under a microscope, were you able to either identify or eliminate that as having been fired from the gun submitted to you? >> i was not. >> tell the jurors what is your findings that you may neither

Call them little sticks. i don't know how you referred to them. >> yes. >> are those one for the right, one for the left hand. >> yes. >> is the stick -- does it go under the finger nail all on the right and then the left. >> every fingers. >> okay. >> also as part of the autopsy is dna or a blood card taken from trayvon martin's body. specifically state's exhibit 186. >> yes.