Scottie Scheffler won the Masters using a TaylorMade L-neck Spider Tour X.
TaylorMade Golf
The Spider Tour X is the same putter style used by Rory McIlroy with the difference being the shape of the hosel, a.k.a. the neck. While Rory uses a short slant neck, Scheffler uses an L-neck, similar to the neck style he used on previous blade putters.
Now if you’re looking for Scottie’s exact putter with the L-neck, you have to go through TaylorMade’s My Spider Program, but if you’re curious about the other options, you can find them all at FairwayJockey.com.