These are three quite popular isolators from Poland, according to NIA the one on the left is CD 443 (http://www.nia.org/general/gifona/text/cd443.htm) marked as IL I TSN-1, the next is CD 441 (http://www.nia.org/general/gifona/text/cd441.htm) marked as IL I TSN - 2, and the smallest one is IL I TS - 3 but without the letter N, marked as CD 440 (http://www.nia.org/general/gifona/text/cd440.htm), no markings according to NIA, but the size is just right. Note that they have longer internal skirts than those shown on the NIA website.