for sale is a pair of excellent condition ER4P, bought them used a few month ago, selling due to the recent upgrade ( to Earsonic SM3).
-- P to S adaptor (1/4") and 1/8"-to-1/4" adaptor.
-- two pairs of tri-flange, used but still soft.
-- one pair of gray small foam, one pair of gray medium foamy, two pairs of yellow large foamy; all are new.
-- three pairs of comply (small, mid, large?), new.
-- filter change tool and four filters.
-- Ety pouch.