From their website:
"The Two.begleri and Jimpy Designs collaboration titanium begleri beads are an immaculate representation of the ingenious simplicity found in all designs created by Two.begleri and the beautiful workmanship found in all things created by Jimpy Designs. Specifically designed with performance, aesthetics, and customization in mind, the Two.Jimpy collaboration beads are like no other. These begleri beads are machined from grade 5 titanium alloy, which makes these beads strong and durable while keeping the weight to approximately 13g per bead (for the chamfered variation. Other variants weigh slightly less). The 4mm hole allows for 275 and 550 paracord compatibility. Unlike most begleri bead options in today's market, these beads are able to be customized to your personal preferences. You can choose from one of three unique bead shapes, a variety of different anodized colors, and even the finish of the beads themselves."