Product Features: Aquarium pre-filter sponge are made of high quality biochemical sponge. Please note these foam are pre filter sponges,so only have single hole. No harm to your baby fish and no harm to water, good for freshwater and saltwater environments. Easily connects to filter intake stem, prevent fine debris or particular matter into filter. Premium pre-filter foam sponges can be quickly and easily attached to the fish tank intake tube stem, preventing small or weaker inhabitants from being drawn into the filter. These cylinder pre-filter sponge suit for all shrimp tank owners and anyone else who has small fish in their tank,provide them a safe environment. Please Note: These foam are pre filter sponges,so only have single hole. Package Includes: 6 x Aquarium Filter Sponge Bilindasly 6PCS Pre Filter Sponge Product Detail: Name: Pre Filter Sponge； Material: Biochemical Sponge； Color: Black； Dimension: Approx. 6.0cm*3.5cm/2.36 x 1.37inch； The inside hole diameter is 1.0cm/0.39 inch Note: Please note these foam are pre-filter sponges, so only have single hole. Please measure the size before purchasing so that you can buy the right product. Sweet Tips: 1.Please allow a little size error due to hand measure. 2.Due to the light and screen difference, the item's color may be slightly different from the pictures. Thank you for your understanding. Application Of Various Place: Aquarium Pre-Filter Sponges made of biochemical sponge,durable, no harm to your baby fish and no harm to water, good for freshwater and saltwater environments. Sponge cover is single-sided connected onto the water inlet of your filter. These pre-filter sponges could help to trap particles and debris, and prolong the life of your filter media, provide efficient water flow with less clogging for long lasting filtration. Suitable for wall-mounted filter inlet and various aquarium product inlets tube size range is from 1cm and 1.3cm. Easily connects to filter intake stem, prevent fine debris or particular matter into filter. Easy to take out to clean. Mini Sponge Fish Filter Aquarium Shrimp Feeding Tube and Dish Glass Aquatic Plant Cup Pot Holder J Shape Glass CO2 Drop Checker Elastic Beading String Line Add to Cart Add to Cart Add to Cart Add to Cart Buying Options Customer Reviews 4.2 out of 5 stars 8 4.4 out of 5 stars 12 3.8 out of 5 stars 6 3.6 out of 5 stars 16 3.1 out of 5 stars 11 Price $5.99$5.99 $10.99$10.99 $5.99$5.99 $8.99$8.99 — no data Meterial Plastic Glass Glass Glass Plastic Function Filter Feeding Aquarium Decoration Aquarium Products Decoration Square Floating Food Feeder Monofilament Fishing Line Manual Fish Tank Water Changer Aquarium Inflow Inlet Filter Aquarium Inflow Inlet Filter Buying Options Buying Options Buying Options Add to Cart Add to Cart Customer Reviews — 4.4 out of 5 stars 6 4.6 out of 5 stars 5 4.2 out of 5 stars 19 4.2 out of 5 stars 12 Price — no data — no data — no data $6.99$6.99 $5.99$5.99 Meterial Plastic Plastic Plastic Sponge Stainless Steel+Plastic Function Feeding Decoration Aquarium Products Filter Filter