Bootstrap FarmerExtra Strength 6 Cell Seedling Starter Trays, 120 Pack (720 Cells), for Seed Germination and Plant Propagation Planting Starting Plugs

Has open strips/ holes down corners for roots to grow... very sturdy and strong

really good quality hard stuff, will last upwards of 10 years aslong as i don't drop em and step on em with some weight.Came with 2-3 broken/chipped ones. guess its expected in delivery.other flaw was there weren't many other options other than 120 +, but really great value still and will eventually be forced into using all of them so they dont just sit out hehehehe, maybe some dwarf matoes in a hydro setup in the trays.didn't find it that difficult to repot by pinching the bottoms, these are sturdy and hard but not impossible to squeeze.update 2022: They really do be hard to pop out sometimes, would be better with a better hole in the bottom to poke em out.

These seedling starting trays will last you a lifetime as they are strong and durable. I use them with a Super Sprouter quad-thick 10" x 20" tray. 12 seedling trays fit snugly into the 10" x 20" tray, and the tops of the seedling trays align perfectly with the tops of the 10" x 20" trays so a humidity dome will fit perfectly with no interference from the seedling trays. And yes they come with both corner slits as well as a 5/8" drainage hole in the bottom. I will definitely be purchasing more of these.

I love these start trays. They are extremely sturdy and will last for years. I love how the bottom has a hole to push the little plants up.

My first impression of the 6 pack cell tray was they are tiny & I intended to return. But these fit so nicely in a 1020 tray with my 5x5 microgreen trays, also from bootstrap farmer. Happy with purchase, excellent durability & value as they will surely last, eliminating use/ need for single use/ “disposable” plastic seed starting trays.