I dont know why people are so hard up for Z1a's!! Believe me gents, they are no stronger than the xx goliath, cactus 5k or sundown 4500d. Believe me I had them all. Matter of fact, I sold both my z1a's to get the old team cactus 5ks which were stronger!!! So I know the new Cactus 5k's will kick the chit out of them!!!