This is made of high-quality PU material, soft and comfortable, skin friendly, long-term wear will not cause discomfort. Measured in 0.51*0.51*0.98 inches, it fits the physiological structure of the human ear canal and provides excellent sound insulation. The dimensions of the earbuds with box are 1.38*1.38*0.71 inches. About logo customization, we provide screen printing, you can print your own logo on the earbud box according to your personal needs. Using advanced slow rebound technology, the earplugs can expand rapidly after being inserted into the ear canal, filling the ear canal gap. Whether you're in your dorm or on the road, these soundproof earplugs can create a relatively quiet environment. The prices for 45000pcs or over are based on ocean shipments.