Thickening treatment, reasonable transition, suitable for transitional connection in the pipe. Made of high quality material, environmentally friendly, non-toxic and hard. Easy installation, using duct tape or duct clamps to connect air duct adapter. Perfectly suited for bathroom, kitchens, apartment, home, office, hotel HVAC system. Perfect to connect 110mm to 100mm duct system. colour:White Material:plastic size: φ110-100mm, upper diameter 98mm, lower diameter 114mm, height 97mm Package Contents: 3 x Pipe Adaptor 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.