Metric Silicone O-ring Cord 4mm Price for 1 ft | eBay
Cord Stock | Global O-Ring and Seal
4mm x 75mm (NBR) Buna-N 70 Duro Metric O-Rings [N4.00X075] : The O-Ring Store LLC, We make getting O-Rings easy!
Amazon.com: 1m Solid Silicone Cord Dia 1mm~25mm White Rubber Gasket Trim Seal Strips O Ring High Temperature Waterproof (Length : 1 Meter, Thickness : Dia 18mm) : Industrial & Scientific