Black Grip Ferrules. KW1-KW17, PA20-PA38, PA41-PA49, PA60-PA78, PH4-PH44, PH49-PH50, PO (Isle Of Wight) TR (Isles Of Scilly) ZE (Channel Isles). Gripped Rubber Base For Increased Traction. Keep Your Floor/Carpet Mark Free And Your Furniture In Position.