OK, I now have 3 sizes available, with updated pricing. These are very high-quality, hand-made, molded fiberglass, felt-lined with a glossy black textured exterior. Lifetime repair/replacement guarantee for normal in-use failure (excludes abuse, fire, theft, and vandalism). I've included individual pricing for those who only need one. Dustcap pricing 6/10/10: Fits: Price: 5" OD tube $30/pr. or $20ea 8" OD tube $40/pr. or $30ea 12"OD tube $60/pr. or $40ea These three sizes fit aluminium tubing as sold by Hastings & Parallax; used on many home-built Newtonians, Cassegrains, and refractors. Coming soon: Dustcaps for D&G 6" and 8" lens cells & dew caps, also the Celestron C-5. Send me an email off-list at this address if interested.