Laser star caps

Hello, Im looking where I can buy star caps for my laser. I found on ebay, but 5 capss cost almost 9 bucks... I can buy laser 5mW with 5 caps for just 12 bucks. I looked on internet but I can found

To fit what host ? Not all caps are created equally.

I dont know which host. Im new in lasers. I have this one laser eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

I understand that host is 12mmx60mm. so I need caps 12mm, right?

I made my own. I got a pack of those cardboard novelty glasses made of diffraction-grating film. They sell them under the names of "fireworks glasses" or "rainbow glasses". The kind that break any points of light into a spray of little spectrums. On an ebay deal I think I got like 10 for $5, or something like that. The excess make fun toys to hand out to visitors. (Warning, do not wear these things around traffic and in cities while riding your bike at night. Tried that once. Do not wear them while driving too. Passenger use ONLY. Could be deadly. They really need to come with a warning on them ... "Do not wear around traffic at night while operating anything that moves.")

Then I took an old twist-to-push-up glue-stick that was all dried out and cut the nested barrels into different parts using an x-acto saw. Using the different sized barrel parts from that, I was able to get 3-levels of adjustments out of it. One stationary and then each smaller barrel-part holding a piece of this diffraction film on the end of it. You need about 3 layers of this diffraction-film to get some settings where they look random enough to look like stars. Otherwise you get concentric patterns (some of those also interesting).

A fun laser novelty for the cost of about $5 and an evening of fiddling around.

Though I find that making a laser-light-show out of two little motors spinning little chips of 1st-surface mirrors to get all those spirograph patterns much more entertaining. Hmmm... I never thought of adding diffraction-grating to that until just now. Will have to try that. Throwing a red, green, and purple laser at it all at the same time. (Each wavelength being spread at a different dispersion angle by the diffraction-grating.)