There are steel framework inside, plating copper, have the size from 4 to 10. Can extend freely.Such as the no. 1 in the photo.

Use the transparent and innocuous material, and steel framework, inner diameter have: 9, 12, 15, 19, 25, 32, 38, 44, 56, 63mm, can use in foodstuff, sanitation, suit for exhaust, airiness etc. in the

Use the spring framework, we have different sizes: 25, 32, 38, 39, 40, 45Such as the no. 5 in the photo

Use the steel framework, can flex freely, the caliber from 38 to 203, suit for motion air-conditions and exhaust etc.Such as the no. 7 in the photo.

The material is aluminium and platinum, it is able to bear hot and fireproofing, can use for water heater, fanner, ventilator, center air-condiction, and also can cleanse the workshops exhaust and aer

Use the aluminum foil and steel framework, can use in exhaust, airiness etc.

Use innocuous material, suit for dust catcher, cleaner, exhaust etc. the size is 38mm, and 183cm lengthSuch as the no. 4 in the photo

Use the EVA material, suit for cleaner and every liquid transportion, the caliber from 25 to 32, 38, 44.Such as the no. 8 in the photo.

Use fo vent wind,can use in Chemicals and living