are standard O-rings available from multiple sources including: http://www.quadrocopter.com/Vibration-Dampener-O-Rings_p_638.html FYI - Some have experienced challenges in obtaining their O-rings for the anti-vibrations systems on Cinestar Multirotors in a timely manner from their typical Hobby or Aerial platform suppliers. Here is some information that may be useful...... All O-ring dimensions are: 0.437 x 0.687 x 0.139 inches (equivalent to metric sizes from Asia) Black are Buna - N material (nitrile rubber) 2-205/N1470 Red are Silicone softest 2-205/S70 Blue are fluro-Silicone medium soft 2-205/SXX Some of the local industrial park suppliers include: Able, Sealsonline, HiTech, Parker, FluidSeal AB Other sources from Asia include: Alibaba (wholesale) and AliExpress (online retailer)