Description: 【Innovative Design】: The breeding box features a 360° perforated design to keep back energy deficiency in mother tiddler after giving birth. The smooth water flow is beneficial for the growth of baby tiddler 【Anti-Suction Feature】: It is designed to hold back small tiddler from being sucked and eaten by larger tiddler due to large gaps at the bottom 【Protection Measures】: The anti-clamping design keeps back tiddler from getting injured or even dying due to small gaps between the breeding tank and the aquarium wall 【Material & Size】: Made of premium pp, this set includes 3 sizes - Large (10*14*13cm) ,Medium (8.5*14*12cm) and Small(6.5*10*8cm) 【Package Includes】: Each package comes with 2 breeding box, fit for different needs in your aquarium setup Specification: Material : pp Size Chart: Large:10cmx14cmx13cm/3.94inchx5.51inchx5.12inch Medium:8.5cmx14cmx12cm/3.35inchx5.51inchx4.72inch Small:6.5cmx10cmx8cm/2.56inchx3.94inchx3.15inch (Bottom diameter x Height x Top Diameter) Package Includes: 1 Large and 1 Medium or 1 Large and 1 Small (optional) or 1 Medium and 1 Small (optional) Note: Please allow slightly errors 1-2cm differences due to manual measurement.