SP Bel-Art Mini-Sieve Micro Sieve Mesh Insert, Assorted (Pack of 8) (F37846-0000)The sieve comes with four exchangeable screen-holding segments, a catch pan, a cover and four screen-retaining rings All parts are molded of polypropylene Hand held sieve for quick field or lab particle size sorting Polypropylene segments and collection pan simply assembles or disassembles for sample insertion and retrieval Sieving specifications are rapidly altered by exchanging the four detachable phosphor-bronze mesh screens