Bianchi Speed Strip, 580, 38/357 Caliber, 6 Rounds, 2 Pack, Black 20054 Bianchi Speed Strips are a compact loading device for revolvers. Made from a flexible urethane material" these strips securely hold 6 rounds of revolver ammunition and conveniently load two rounds at a time. Speed Strips fit in most single mag/knife pouches and in a trouser or shirt pocket and are offered in two sizes.