YonKa Galbol 90 Firming Concentrate - 0.5 oz by YonKa. $43.50. Enhances skin firmness.. Galbol 90 enhances the subtle contours of facial structures with a deep-reaching tightening effect. Relaxes the features. It clarifies and hydrates with a firming and strengthening effect. Facial contours are rested and tightened. The shape of the face and individual features are enhanced. The complexion is well hydrated.