If you're feeding pinkies, whether they be live or f/t, your boa may not need to constrict them as they pose no harm to it. Even the smallest RTBs can handle fuzzy/hopper mice and without trouble. Don't let their small head and thin neck trick you. Also, fuzzies and hoppers provide stimulating movements to all snakes and so you will not need to wiggle them as you do with pinkies .