STRONG MATERIAL: This drip irrigation tees are made of high grade plastic which are strong and good for both indoor and outdoor use.Inner diameter 16mm EASY INSTALLATION: Connect irrigation tubing by simply insert this barbed connector at the ends of the tube. No tools or glue required. Push the tube firmly into the irrigation barbed to avoid leakage. Soften of tube with blower if you find the tube is too stiff before inserting. WIDE APPLICATIONS: These irrigation fittings are essential for watering system, drip system and sprinkle system in vegetable gardens, flower beds, greenhouse and patio. Use irrigation barbed to build yourself a minimal maintenance watering system, save water and energy. Colour:black Material:plastic Package Contents: 100 * tee barbed connectors Drip Irrigation Connectors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.