BUTTERFLY Doppler (Special Edition) Product rating: Not rated yet. Be first! Your rating: BUTTERFLY Doppler (Special Edition) $29.90 incl. VAT $29.90 incl. VAT Discount $0 Quantity discounts pcs and more: /pc pcs Add to Cart Availability: In stock - ready for shipping Delivery date: 22.1.2020 Producer: Roy Knives Butterfly knife was introduced as part of the Operation Breakout update. The package includes a knife and a knife case. The knives are blunt so they are suitable for training or as a decorative item. Our knives come with 2 years warranty.