The Barwalt 3/8" + Hollow Spacers (300/pk) are industry-approved, leave-in tile spacers designed to streamline tile installation. These cross-shaped (+) spacers feature a hollow, compressible design that allows them to remain in the grout joint—eliminating the need for removal and enabling earlier grouting. Made from high-quality rubber material, they compress up to 10% to accommodate tile size variances, ensuring a smooth, lippage-free finish.