1 Low friction, avoiding noise 2 Good seal, avoiding insect, dust, moisture, wind leakage 3 Use easily on frame & groove 4 PP 1 Suitable for the aluminum & PVC wooden profiles (eg, wardrobe frames, solid door frames, sliding door frames, window frames, etc.). 2 Be dust proof & wind proof & moisture proof & low friction, avoiding insects & noise. 3 Available for all specifications (size, color, ...