The is the universal glass whip for all our VP Edition glass on glass interface exception for the digital revolution 5.1 vaporizer. Just in case you lose your glass whip or break it, you can purchase a replacement from us for only $20. If you shop elsewhere, you are looking at glass whip price of over $35. This glass whip fits on most brand of vaporizers that uses hand free whips. We also offer quantity discount, and shipping is free anywhere in the US.