Just got these and they are a cinch to snap on or off the spokes (They seem to snap more easily on to bladed spokes). they weigh practically nothing (foamed hard plastic), and are reflective Scotchlite material. I love them!
Great Idea -- Easy to install
Seth on 4/1/16
I ordered one ten pack last year. I liked them so much I ordered three more ten packs and now I have 20 on each wheel. Probably overkill, but they're so easy to install and don't get in the way.