Succulent Plant (Cactus), Selenicereus Testudo 'Dogtail'
The spines on this trailing cactus are on the soft side. If I pick up a piece, a few needles may stick to my fingers, but they're thin and easy to remove with fingers.
Needs medium to bright light but may not be able to handle full sun in warm or hot weather. Low-to-medium water usage (I water mine just a bit every week.) Easy to grow. Loves to branch out, and you can force it to do so by cutting stems here and there in your planter about 1-2 inches above the soil.