Giftshop12 Plastic Koi Fish Goldfish Shaped Mold By Giftshop12. This is a piece of fish mold, featuring 6 fish. Quality guaranteed Material: sturdy plastic. Each fishs measurements: 4" (length) x 3"(width) x 1" (depth) or 10.2cm (length) x 7.6cm (width) x 2.5cm (depth) Suitable for making cold desserts. Reusable.