I bought some of these for my Shine 2 since black o-rings would cast a shadow on the legends.
They work fine on keys that have the complete cross support connected to the stem. Otherwise, you need to double up on the o-rings.
Compared to
50A black o-rings, the white/translucent o-rings are softer.
Edit: Found this pack of 100 70A black o-rings for US$2.08. The above link is US$9.17 for a pack of 125.Edit 2: Oops. The pack of 100 was for
70A black o-rings.