Unlike single-color markers that clutter craft kits or non-waterproof options that smudge, these markers solve 4 key pain points for crafters: their double-ended design cuts down on tool quantity, saving space in kits and making it easy to switch shades mid-project the quick-drying acrylic ink sets in minutes, preventing smudges even on smooth surfaces like glass or plastic, and stays waterproof after drying—ideal for outdoor rocks or functional items like ceramic mugs the medium-tip nibs balance precision and coverage, working for fine details and bold fills and the ink adheres permanently to all listed surfaces, resisting fading, peeling, or washing out.