The CZ Polymer Magazine is an OEM factory replacement designed for CZ 455, 457, and 512 models chambered in .22WMR or .17HMR. It features a durable polymer construction with a steel follower for reliable performance. Available in 5-round or 10-round capacities, these magazines are multi-caliber compatible for .17HMR and .22WMR but are not compatible with CZ 452 or 453 models.