40 x 50 x 1 mm - will not fit 1-1/4" threaded elements, this is merely a substitute only for the one group P_403 element, usually M_65. No longer able to source, only one left.
See also: the thicker paper version, SP_27.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.