TURBOFLEX OPT. TX152 Eyeglasses 020 Dark Slate Grey 56mm delivers real-world value. Here’s a closer look: TURBOFLEX OPT. TX152 Eyeglasses 020 Dark Slate Grey 56mm See photos and details: TURBOFLEX OPT. TX152 Eyeglasses 020 Dark Slate Grey 56mm. To get 10% discount use the coupon code VSC10.