Agreed, cultured Chinese FWP.
That's a nice size, and since they are solid nacre, there is no bead nucleus to wear through if you wear the pearls often. The nacre won't ever wear off.
That said, you still want to take care of them to keep them lustrous. Sweat, perfumes, hair spray, air pollution etc. are not good for pearl nacre. Always put your pearls on last, after you are done applying perfume or hair products. When you take them off, wipe them with a soft cloth (I like to use a microfiber cloth.) You can even dampen the cloth lightly but try not to get the silk wet as the knots may stretch and gap. If you do need to wash the pearls someday, soak them briefly in mild soapy water (not detergent), rinse and wrap them gently in a towel to dry slowly (the silk inside the pearls takes longer to dry.)