Watch O-ring Silicone Packing Assorted 6 Pieces, Product Selection, Thickness 0.5mm
O-ring silicone rubber packing for wristwatches.Choose 6 pieces individually. Combinations are complimentary.Thickness: 0.5mmCoil diameter: 19 sizes12mm / 13mm / 14mm / 15mm / 16mm / 17mm / 18mm / 19mm / 20mm / 21mm / 22mm / 23mm / 24mm / 25mm / 26mm / 27mm / 28mm / 29mm / 30mm.Please be sure to specify the sizes in the comment section or transaction message.*If you do not contact us with the sizes within 2 days, we will ship one each of 12, 15, 18, 21, 24, and 27 (6 pieces total). In that case, returns and exchanges are not possible. Please purchase the desired sizes again.I installed a 30mm O-ring on the 36mm rubber mounting part of the back cover, and it fit perfectly and looked good. I think a slightly smaller size is just right.Watch parts, watch components