Observation box is made of transparent acrylic, high light transmittance provides a clear viewing experience. Clearly observe the fish condition inside the box. Safe, durable and easy to clean. Compact SizePortable fish breeding box size is S: 10cm x 5cm x 2.5cm / 3.94inch x 1.97inch x 0.98inch, L: 16cm x 3.8cm x 5.8cm / 6.30inch x 1.50inch x 2.28inch; Lightweight and easily stored in a bag or pocket for portability. Fishing Photo TankSmall acrylic photo box for aquarium fish, ideal for photographing your fish while keeping it in water. Temporarily holds the fish in the box for convenient picture taking. Includes clear scale markings for easy measurement recording. MultipurposeMultifunctional design serves as a mini aquarium with lid, hatching box, or fish isolation box, suitable for small fish, crabs and other aquatic creatures. Also ideal as a viewing box for insects, snails, geckos, and other small animals. Great GiftClear storage and viewing box suitable for both professionals and beginners. Makes a thoughtful gift for aquarium enthusiasts. Specification: Material: Acrylic Size: S: 10cm x 5cm x 2.5cm / 3.94inch x 1.97inch x 0.98inch L: 16cm x 3.8cm x 5.8cm / 6.30inch x 1.50inch x 2.28inch Package Includes: 1 x Small Fish Tank Note: Please allow slight variations due to manual measurement and differences in display monitors.