Red SILICONE rubber bead lock o-rings. Silicone rubber is the best, longest lasting o-ring material available. Will NOT crack from age or sunlight or degrade from the usual solvents and cleaners. 1.8mm MOST COMMONLY used on bead locks that nearly bottoms out on wheel, i.e. (DWT, OTK/Tony, AMV, CRG, GP, Aluminos & more+). 2.4mm typically used on larger KNURLED beadlocks, Freeline, ART/Birel, etc. Sold in 12-packs.
