Rubber Ring Karet Seatpost Fungsi : Melindungi Seatpost + Frame Tube Meminimalisir Air masuk ke Frame Meminimalisir Debu masuk ke frame Bisa untuk menandai kedalaman atau batas tinggi/pendek seatpost Menambah keren tampilan sepeda Name:Bicycle silicone seat rod waterproof cover Material: Soft silicone Specifications: Small : 25-30mm (suitable for 25.4/27.2mm seatpost); Large : 30-35mm (suitable for 30.4/30.8/30.9/31.6/33.9mm diameter seatposts).