Dimensions: 10 cm x 15.5 cm High-Quality Materials: The retainer is made of high-quality plastic, wear-resistant and durable, resistant to compression and tension, and can be used for a long time. The package contains 8 retainers, a sufficient quantity to meet your needs. Safe and Convenient: The bed sheet clips can help you solve the problem of bed sheets shifting while you sleep. The four-pronged grip firmly holds the sheets to ensure they don't slip, keeping the mattress and sheets securely in place. Widely Used: The retainer clip is suitable for most mattresses and is used to secure bed sheets, both thick fleece and thin comforters. Keep your sheets tidy, sleep more comfortably, and enjoy a more comfortable life. Easy installation: First, attach the base under the mattress, then attach the round loop to the bed sheet. Align the hole and press the loop; the sheets will be firmly attached to the mattress, so you won't have to worry about flipping the mattress. Easy to remove: If you need to remove it, simply press the loop again to easily release it. No needles or marks from removal. No tools required, saving you time and effort.