Transparent flap with silent action and a 360° circumferential seal (TPR) with a turn-lock fastener. Minimum installation depth of 5 mm. Total measurements are 20 x 22 cm, with a cut-out size of 15.9 x 16.8 cm and a flap size of 14 x 15.5 cm. This TRIXIE 4-way cat flap door gives your pet a free pass to enter or leave the house even when the door is shut. Made of plastic.