More Details Buy. ROXTEC, RM00115401000, RM MODULE WITH 3 CORES, MULTIDIAMETER MODULE, RM15W40. Price $16.49. More Details Buy. ROXTEC RM00100201000, RM MODULE WITH CORE, MULTIDIAMETER MODULE, RM20. Price $6.55. More Details Buy. ROXTEC, RM00120401000, RM MODULE WITH 2 CORES, MULTIDIAMETER MODULE, RM20W40. Price $12.49.