The 26x1.95 ones that I used to fix my friends bike definitely have a metal screwed lock ring that helps prevent the valve shifting if the pressure runs lower than it ought to, yes.

This tube has a Schrader valve which is pushed through the rim with a locking ring on it to secure it in place.

The ones i bought were schrader, the valve stems were very long allowing for those deeper rims. The entire length of the valve is threaded so that it can be screwed into rims (mine dont offer this feature). The tubes also came with a groovy clear valve cap and a little nut that can be screwed down the entire length of the step to secure the valve on the inside of the rim.

Yes they do

Yes there is a Clear plastic cap for the tube

The Schwalbe Schrader 26x1.95 that I fitted to me friends bike certainly came with bullet-point shaped, transparent plastic caps. And a screw-down metal lock ring too.

Hope that helps! :o)

Yes they do

Ah, erm, well the two I ordered from Wiggle last week DO have removable cores! Confusing. I've got a 26" x 1.5-2.5 sat in front of me with the core removed! It's possible Schwalbe are phasing them out, I guess... Hope not as they appear to be the only co. making them.