Lottman Breaking Heads The MS-35 Lottman Breaking Head for 4in (102mm) diameter Asphalt Specimans consists of upper and lower stainless steel loading strips with aluminum concave contact surface base and crossbar. Similar Model MS-36 is a scaled-up version for Lottman testing of 6in (152mm) diameter specimens up to 115mm thick. Est. Ship Wt.: 24lb (11kg).