State Street Global Advisors on Wednesday introduced three SPDR exchange-traded funds that tap into cutting-edge technologies steeped in the new economy.

The three funds track proprietary indexes developed by Kensho Technologies, a provider of next-generation analytics, machine learning and data visualization systems. As per the funds literature, these SPDR Kensho ETFs focus on companies helping to drive the “Fourth Industrial Revolution.”

All three ETFs are based on modified equal weight indexes, and all three have expense ratios of 0.45 percent.

The SPDR Kensho Intelligent Structures ETF (XKII) invests in companies involved with smart building infrastructure, smart power grids, intelligent transportation infrastructure and intelligent water infrastructure.

The SPDR Kensho Smart Mobility ETF (XKST) centers on companies engaged in autonomous vehicles, drones and drone technology for civilian and/or commercial application, and advanced transport systems.

The SPDR Kensho Future Security ETF (XKFS) seeks companies focused on cyber security, advanced border security and military applications such as robotics, drones and drone technologies, space technology, wearable technologies and virtual or augmented reality activities.

Nick Good, co-head of the Global SPDR business at State Street Global Advisors, said in a prepared statement that these new ETFs enable investors to make targeted allocations to emerging economic trends.

State Street now has 36 U.S.-listed sector and industry SPDR ETFs with more than $160 billion in assets as of late December. Spicing up the SPDR lineup with these newfangled thematic funds seems like a shrewd marketing and business move because many thematic ETFs focused on cutting-edge technologies and industries, ranging from autonomous vehicles and artificial intelligence to genomics and robotics, have produced boffo returns and been a hit with investors.

It will be hard for such funds in 2018 to repeat their stellar performance from last year. But for the most part they’re focused on areas that appear to have long-term staying power.