WAVE HT108 A4 帶凹槽切割板
https://www.hobby-wave.com/products/ht108/
 
Two 10 mm wide grooves are formed on the mat surface
Three pockets are processed
You can use it by dropping important parts in your pocket and dropping unnecessary chips into grooves.
Various sizes and shapes with high versatility are printed on various guidelines that are convenient for cutting out such as masking tape. (The guidelines are printed on only one side.)
(Quoted from Wave Corporation)