Dale those silvery ziploc bags are static-proof bags designed to protect electronic bits. Neat and pretty, but functional too!
Sometimes I cut those into little insulation discs. 
Hmm interesting idea. Any idea how they handle heat?
They can handle quite a lot of heat, but will start to melt and shrink if in direct contact with the heat source. I use the package that the LEDās come in from Richard fairly often. Have yet to have molten plastic to clean up inside a light. Itās just cheap insurance to keep the reflector from touching. 
That said, I did break down and buy some Kapton tape. Cut up most of the excess on my solder paste masks from OSHStencilsā¦.
Those description cards are also stickers :)
Ordered 3-14
Awaiting shipment 3-14
Awaiting pickup 3-16
Shipped with a working tracking number 3-16
Where possible I put the little sticker inside the battery tube to indicate exactly what emitter was used. Then my horrible memory means nothing.
Holy fast shipping Batman.
I ordered 3-14, shipped on 3-16, processed through customs 3-18, and is at the USPS sort facility today 3-20.
Mine are still somewhere in routeā¦ ordered on 3/7 and 3/9 :~
Have bought 4 times from them, mostly SinkPads and emmiters, 2/4 orders had problems!
It seems to be a 50-50 game, once I recieved a wrong order and they offered to resend the right one which never came(3-4 months passed, took the money back from PayPal).
Second time a 35$ order which for me is not a small amount of money, order still not recieved after almost 50days, no answer to emails, live chat: āsorry we are not aroundā sience 2 weeks. I opened a PayPal dispute on the 43rd day and am waiting for refund.
One thing is sure, I am not buying from them again! I ordered the items for lck-led, which may be the same seller and hope to recieve themā¦.
Edit: Took the 35$ back from PayPal, they seem to be still offine on the live chatā¦and still no package recieved!
I wish I had researched leddna prior to my purchase, itās been 3 months since my order and I never receiver the items, never got a tracking number, and every few weeks I send them a message that to this day none were answered. Guess Iām at a loss, so if anyone lands here looking for a place to buy emitters, I recommend avoiding this store
You didnāt pay with Paypal? If you did you can file dispute.
I ordered optics from them in December and they arrived quickly.
What is the free shipping method that they normally offer? Is it registered mail at the very least, and do they give the tracking no?
No info on shipping method nor tracking number were made available for me
That is not good. From what Iāve experienced, China Post Ordinary Small Packet Plus is one the slowest, but tracking or no tracking, the least they could do is inform you about your shipment status.
Iāve just entered a dispute via paypal after a last attempt to get some communication via email that also got no response. Thanks Mike C for the tip, I had forgotten that I paid via PP
Thatās good. I hope you at least get your money back.
Could be out of business. No update for their site since end of 2019 according to archive.org.
http://web.archive.org/web/20200915000000*/http://www.leddna.com/