Jul 6, 2024 - The best structure for your nails. ever.12 PK (one mold per size) 00, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 CURVE, and deep c curve. Extra long. Now you can do extra long Nails easy, works also for short Nails with straight structure.