Package Included: 2x Black (1*S+1*M), 2x Red (1*S+1*M).
Size S is for 20-25mm; Size M is for 30-34mm.
Material: Silicon.
25-30mm covers 25.4/27.2mm AND 30-35mm covers 30.4/30.8/30.9/31.6/33.9mm seat post diameter.
This product will protect the seat post from dust, water, sand and mud; Avoid seat post surface scratching due to foreign material intrusion.