Magnetic clasp -stainless steel. Fairly hefty. Two magnets - quite strong - fits into tube, so cannot slide sideways and needs to be pulled open. Nice deep cavities. Securely glue onto leather, cord, silversilk, viking knit, or kumihimo, beaded rope (to resist the pulling action of opening.)
Made in China. 10mm x 26.5mm Hole size is approx. ID 5mm. By the each.