What's in the box:

Aibecy MGN9H 300mm Linear Rail Guideway Rail with Block for 3D Printer CNC Machine (Silver)

Features:
Made of high quality metal, sturdy and durable.
Compact and lightweight, ideal for small equipment.
Adopting 4 point contact design, it can bear load from every direction.
Designed with ball retainer, which allows interchangeability in the case of small precision.
Widely apply for 3D printer, CNC machine, automatic equipment, precision measuring equipment, etc.

Specifications:
Material: Metal
Rail Size: 30 * 0.9 * 0.6cm/ 11.8 * 0.4 * 0.2in
Rail Weight: 104g/ 3.7oz
Block Size: 4 * 1.9 * 0.7cm/ 1.6 * 0.7 * 0.3in
Block Weight: 26g/ 0.9oz
Package Size: 33 * 6.5 * 2cm/ 13.0 * 2.6 * 0.8in
Package Weight: 165g/ 5.8oz

Package List:
1 * Linear Rail
1 * Linear Rail Block