These replacement pods are compatible with the Smok RPM 4 Pod Device and come in a set of three. It has a magnetic connection, bottom silicone fill port, and a 5.0 mL e-juice capacity. The two versions work with either the Smok LP2 or RPM coils. Refillable Pod System Magnetized connection Bottom silicone fill port 5.0 mL e-liquid capacity PCTG material construction https://www.vapeuniverse.co/products/smok-rpm-4-pods?pr_prod_strat=e5_desc&pr_rec_id=6e70570ac&pr_rec_pid=7846686589180&pr_ref_pid=7846676529404&pr_seq=uniform